2020 |
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 | Horvath, Nicholas; Honeycutt, Andrew; Davies, Matthew A Grinding of additively manufactured silicon carbide surfaces for optical applications Journal Article CIRP Annals, 69 , pp. 509-512, 2020. Abstract | Links | BibTeX | Tags: manufacturing, related @article{Horvath19-ab, title = {Grinding of additively manufactured silicon carbide surfaces for optical applications}, author = {Nicholas Horvath and Andrew Honeycutt and Matthew A. Davies}, url = {https://doi.org/10.1016/j.cirp.2020.04.079}, year = {2020}, date = {2020-05-19}, journal = {CIRP Annals}, volume = {69}, pages = {509-512}, abstract = {Many of the properties of Silicon carbide (SiC) are advantageous for optical applications, such as telescope mirrors and industrial laser systems. However, the base shapes of complex components are costly and difficult to manufacture. Leveraging additive manufacturing, near net complex components are readily processed. Here, we investigate the post processing of additively manufactured SiC (AM SiC) compared to chemical vapor deposited (CVD) SiC. The specific grinding energy for the AM SiC was lower than CVD, however the trends were the same. A specular finish was observed on both materials but the AM SiC finish was limited due to residual porosity.}, keywords = {manufacturing, related}, pubstate = {published}, tppubtype = {article} } Many of the properties of Silicon carbide (SiC) are advantageous for optical applications, such as telescope mirrors and industrial laser systems. However, the base shapes of complex components are costly and difficult to manufacture. Leveraging additive manufacturing, near net complex components are readily processed. Here, we investigate the post processing of additively manufactured SiC (AM SiC) compared to chemical vapor deposited (CVD) SiC. The specific grinding energy for the AM SiC was lower than CVD, however the trends were the same. A specular finish was observed on both materials but the AM SiC finish was limited due to residual porosity. |
 | DeMars, L A; Mikula-Zdankowska, M; Falaggis, K; Porras-Aguilar, R Single-Shot Phase Calibration of a Spatial Light Modulator using Geometric Phase Interferometry Journal Article Appl. Opt., 2020. BibTeX | Tags: CEFO metrology, CeFO related @article{DeMars_02, title = {Single-Shot Phase Calibration of a Spatial Light Modulator using Geometric Phase Interferometry}, author = {L. A. DeMars and M. Mikula-Zdankowska and K. Falaggis and R. Porras-Aguilar}, year = {2020}, date = {2020-01-01}, journal = {Appl. Opt.}, keywords = {CEFO metrology, CeFO related}, pubstate = {published}, tppubtype = {article} } |
2019 |
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Swain, Biswa Ranjan; Dorrer, Christophe; Qiao, Jie High-performance optical differentiation wavefront sensing towards freeform metrology Journal Article Opt. Express, 27 (25), pp. 36297-36310, 2019. Abstract | BibTeX | Tags: CeFO related, metrology @article{Swain2019, title = {High-performance optical differentiation wavefront sensing towards freeform metrology}, author = {Biswa Ranjan Swain and Christophe Dorrer and Jie Qiao}, year = {2019}, date = {2019-12-09}, journal = {Opt. Express}, volume = {27}, number = {25}, pages = {36297-36310}, abstract = {We report the demonstration of freeform optics metrology with an optical differentiation wavefront sensor that relies on spatially dithered distributions of binary pixels to synthesize a far-field amplitude filter. Analysis of experimental results and comparison with a commercial low-coherence-length interferometer shows that freeform phase plates with different magnitude of wavefront slopes can be accurately characterized. RMS accuracy of ∼ λ/10 and precision of ∼ λ/70 at 633 nm were achieved with pixelated filters having 2.5-µm pixels. Simulations that describe the characterization of a freeform optical component in the presence of photodetection noise and filter nonlinearity demonstrate the robustness of this wavefront-sensing approach for freeform optics characterization.}, keywords = {CeFO related, metrology}, pubstate = {published}, tppubtype = {article} } We report the demonstration of freeform optics metrology with an optical differentiation wavefront sensor that relies on spatially dithered distributions of binary pixels to synthesize a far-field amplitude filter. Analysis of experimental results and comparison with a commercial low-coherence-length interferometer shows that freeform phase plates with different magnitude of wavefront slopes can be accurately characterized. RMS accuracy of ∼ λ/10 and precision of ∼ λ/70 at 633 nm were achieved with pixelated filters having 2.5-µm pixels. Simulations that describe the characterization of a freeform optical component in the presence of photodetection noise and filter nonlinearity demonstrate the robustness of this wavefront-sensing approach for freeform optics characterization. | |
 | Yoon, C; Bauer, A; Xu, D; Dorrer, C; Rolland, J P Absolute linear-in-k spectrometer designs enabled by freeform optics Journal Article Optics Express, 27 (24), pp. 34593-34602, 2019. Abstract | Links | BibTeX | Tags: CeFO related @article{lineark, title = {Absolute linear-in-k spectrometer designs enabled by freeform optics}, author = {C. Yoon and A. Bauer and D. Xu and C. Dorrer and J. P. Rolland}, url = {https://doi.org/10.1364/OE.27.034593}, year = {2019}, date = {2019-11-25}, journal = {Optics Express}, volume = {27}, number = {24}, pages = {34593-34602}, abstract = {Linear-in-wavenumber, k, spectrometers have the merits of saving signal processing time and improving the sensitivity of spectral-domain optical coherence tomography (SD-OCT) by avoiding post-k-interpolation. We report on an approach leveraging freeform optics to linearize spectrometers in k to achieve an extremely low residual k-nonlinearity in design. A freeform lens reduced the k-nonlinearity from 2.47% for a benchmark spectrometer to 2.79 × 10−5% and 3.36 × 10−9% using the Fringe Zernike coefficients up to the 16th term and 37th term, respectively. A simulation model was developed to evaluate the performance of SD-OCT with the designed spectrometers. Without the k-interpolation in software, results show that the two freeform spectrometers achieve a roll-off gain of 5.24 dB over the imaging depth from 0.5 to 5.5 mm, while the maximum imaging depth is 5.8 mm. Finally, a 4.2-µm-FWHM axial PSF was maintained throughout the imaging depth in air.}, keywords = {CeFO related}, pubstate = {published}, tppubtype = {article} } Linear-in-wavenumber, k, spectrometers have the merits of saving signal processing time and improving the sensitivity of spectral-domain optical coherence tomography (SD-OCT) by avoiding post-k-interpolation. We report on an approach leveraging freeform optics to linearize spectrometers in k to achieve an extremely low residual k-nonlinearity in design. A freeform lens reduced the k-nonlinearity from 2.47% for a benchmark spectrometer to 2.79 × 10−5% and 3.36 × 10−9% using the Fringe Zernike coefficients up to the 16th term and 37th term, respectively. A simulation model was developed to evaluate the performance of SD-OCT with the designed spectrometers. Without the k-interpolation in software, results show that the two freeform spectrometers achieve a roll-off gain of 5.24 dB over the imaging depth from 0.5 to 5.5 mm, while the maximum imaging depth is 5.8 mm. Finally, a 4.2-µm-FWHM axial PSF was maintained throughout the imaging depth in air. |
Alonso, Kevin Liang; Miguel A Effects on the OTF of MSF structures with random variations Journal Article Optics Express, 27 (24), pp. 34665-34680, 2019. Abstract | Links | BibTeX | Tags: CeFO design @article{Alonso2019b, title = {Effects on the OTF of MSF structures with random variations}, author = {Kevin Liang; Miguel A. Alonso }, doi = {10.1364/OE.27.034665}, year = {2019}, date = {2019-11-11}, journal = {Optics Express}, volume = {27}, number = {24}, pages = {34665-34680}, abstract = {In diamond-machined freeform manufacturing processes, a tool-tip often leaves behind characteristic mid-spatial frequency (MSF) structures on the optical surface. Unwanted movement between the tool-tip and the part results in MSF structures with random variations. Here, we analyze the effects of these MSF structures on the system’s optical performance and derive simple analytic estimates for the optical transfer function in terms of the parameters of these structures. These expressions are expected to aid in MSF tolerancing.}, keywords = {CeFO design}, pubstate = {published}, tppubtype = {article} } In diamond-machined freeform manufacturing processes, a tool-tip often leaves behind characteristic mid-spatial frequency (MSF) structures on the optical surface. Unwanted movement between the tool-tip and the part results in MSF structures with random variations. Here, we analyze the effects of these MSF structures on the system’s optical performance and derive simple analytic estimates for the optical transfer function in terms of the parameters of these structures. These expressions are expected to aid in MSF tolerancing. | |
 | Bauer, A; Pesch, M; Muschaweck, J; Leupelt, F; Rolland, J P All-reflective electronic viewfinder enable by freeform optics Journal Article Optics Express, 27 (21), pp. 30597-30605, 2019. Abstract | Links | BibTeX | Tags: CeFO design, CeFO related @article{BauerARRI, title = {All-reflective electronic viewfinder enable by freeform optics}, author = {A. Bauer and M. Pesch and J. Muschaweck and F. Leupelt and J. P. Rolland}, url = {https://doi.org/10.1364/OE.27.030597}, year = {2019}, date = {2019-10-14}, journal = {Optics Express}, volume = {27}, number = {21}, pages = {30597-30605}, abstract = {Refractive eyepiece design forms are often limited by chromatic aberrations and require a mix of glass types to achieve sufficient correction, thus they are not conducive to manufacture in volume. Reflective surfaces are inherently achromatic and can be produced in volume, but rotationally symmetric reflective surfaces are either used with lossy obscurations or are incapable of correcting rotationally variant aberrations when used in an unobscured form. Freeform optics enable unobscured reflective design forms with excellent image quality. Here, we document the design, fabrication, and assembly of an all-reflective high-end electronic viewfinder that shows the applicability of freeform surfaces to eyepiece design forms.}, keywords = {CeFO design, CeFO related}, pubstate = {published}, tppubtype = {article} } Refractive eyepiece design forms are often limited by chromatic aberrations and require a mix of glass types to achieve sufficient correction, thus they are not conducive to manufacture in volume. Reflective surfaces are inherently achromatic and can be produced in volume, but rotationally symmetric reflective surfaces are either used with lossy obscurations or are incapable of correcting rotationally variant aberrations when used in an unobscured form. Freeform optics enable unobscured reflective design forms with excellent image quality. Here, we document the design, fabrication, and assembly of an all-reflective high-end electronic viewfinder that shows the applicability of freeform surfaces to eyepiece design forms. |
 | LAUREN L. TAYLOR JING XU, MICHAEL POMERANTZ THOMAS SMITH JOHN LAMBROPOULOS R C; QIAO, JIE Femtosecond laser polishing of germanium Journal Article Optical Materials Express, 9 (11), pp. 4165-4177, 2019. Abstract | Links | BibTeX | Tags: CeFO manufacturing, CEFO metrology, fabrication, Freeform surfaces, manufacturing, Mid-Spatial Frequency error @article{TAYLOR2019, title = {Femtosecond laser polishing of germanium}, author = {LAUREN L. TAYLOR, JING XU, MICHAEL POMERANTZ, THOMAS R. SMITH, JOHN C. LAMBROPOULOS, AND JIE QIAO}, url = {https://doi.org/10.1364/OME.9.004165}, year = {2019}, date = {2019-10-02}, journal = {Optical Materials Express}, volume = {9}, number = {11}, pages = {4165-4177}, abstract = {Freeform optics can reduce the cost, weight, and size of advanced imaging systems, but it is challenging to manufacture the complex rotationally asymmetric surfaces to optical tolerances. To address the need for disruptive, high-precision sub-aperture forming and finishing techniques for freeform optics, we investigate an alternative, non-contact polishing methodology using femtosecond lasers, combining modeling, experiments, and demonstrations. Femtosecondlaser- based polishing of germanium was investigated using an experimentally-validated twotemperature model of laser/germanium interaction to guide the understanding and selection of laser parameters to achieve near-nonthermal ablation for polishing and figuring. For the first time to our knowledge, model-guided femtosecond laser polishing of germanium was successfully demonstrated, achieving precision material removal while maintaining single-digit nanometer optical surface quality. The demonstrated femtosecond-laser-based polishing technique lays the foundation for semiconductor optics polishing/fabrication using femtosecond lasers and opens a viable path for high-precision, complex sub-aperture optical polishing tasks on various materials.}, keywords = {CeFO manufacturing, CEFO metrology, fabrication, Freeform surfaces, manufacturing, Mid-Spatial Frequency error}, pubstate = {published}, tppubtype = {article} } Freeform optics can reduce the cost, weight, and size of advanced imaging systems, but it is challenging to manufacture the complex rotationally asymmetric surfaces to optical tolerances. To address the need for disruptive, high-precision sub-aperture forming and finishing techniques for freeform optics, we investigate an alternative, non-contact polishing methodology using femtosecond lasers, combining modeling, experiments, and demonstrations. Femtosecondlaser- based polishing of germanium was investigated using an experimentally-validated twotemperature model of laser/germanium interaction to guide the understanding and selection of laser parameters to achieve near-nonthermal ablation for polishing and figuring. For the first time to our knowledge, model-guided femtosecond laser polishing of germanium was successfully demonstrated, achieving precision material removal while maintaining single-digit nanometer optical surface quality. The demonstrated femtosecond-laser-based polishing technique lays the foundation for semiconductor optics polishing/fabrication using femtosecond lasers and opens a viable path for high-precision, complex sub-aperture optical polishing tasks on various materials. |
Feng, Tao; Sahoo, Pankaj K; Arteaga-Sierra, Francisco R; Dorrer, Christophe; Qiao, Jie Pulse-Propagation Modeling and Experiment for Femtosecond-Laser Writing of Waveguide in Nd:YAG Journal Article Crystals , 9 (8), pp. 434, 2019. Abstract | BibTeX | Tags: CeFO related, manufacturing @article{Feng2019, title = {Pulse-Propagation Modeling and Experiment for Femtosecond-Laser Writing of Waveguide in Nd:YAG}, author = {Tao Feng and Pankaj K. Sahoo and Francisco R. Arteaga-Sierra and Christophe Dorrer and Jie Qiao}, year = {2019}, date = {2019-08-20}, journal = {Crystals }, volume = {9}, number = {8}, pages = {434}, abstract = {In this work, unidirectional pulse propagation equation (UPPE) modeling is performed to study the nonlinear laser-mater interaction in silicon and Nd:Y3Al5O12 (Nd:YAG) crystals. The simulation results are validated with reported experimental results for silicon and applied to Nd:YAG crystals with experimental validation. Stress-induced waveguides are written in Nd:YAG crystals using 515 nm, 300 fs pulses at a 1 kHz repetition rate. Waveguides having a mean propagation loss of 0.21 ± 0.06 dB/cm are obtained, which is lower than the previous reported values for Type-II waveguides written in Nd:YAG crystals. The modeling and experimental results consistently show that the modification (waveguide track) depth increases with input energy. A detailed analysis is presented to control the modal properties of the waveguide in the context of UPPE simulation.}, keywords = {CeFO related, manufacturing}, pubstate = {published}, tppubtype = {article} } In this work, unidirectional pulse propagation equation (UPPE) modeling is performed to study the nonlinear laser-mater interaction in silicon and Nd:Y3Al5O12 (Nd:YAG) crystals. The simulation results are validated with reported experimental results for silicon and applied to Nd:YAG crystals with experimental validation. Stress-induced waveguides are written in Nd:YAG crystals using 515 nm, 300 fs pulses at a 1 kHz repetition rate. Waveguides having a mean propagation loss of 0.21 ± 0.06 dB/cm are obtained, which is lower than the previous reported values for Type-II waveguides written in Nd:YAG crystals. The modeling and experimental results consistently show that the modification (waveguide track) depth increases with input energy. A detailed analysis is presented to control the modal properties of the waveguide in the context of UPPE simulation. | |
ALEMÁN-CASTAÑEDA, LUIS A; ALONSO, MIGUEL A Study of reflectors for illumination via conformal maps Journal Article Optics Letters, 44 (15), pp. 3809-3812, 2019. Abstract | Links | BibTeX | Tags: design, related @article{ALONSOALEMAN2019, title = {Study of reflectors for illumination via conformal maps}, author = {LUIS A. ALEMÁN-CASTAÑEDA AND MIGUEL A. ALONSO}, editor = {Optical Society of America }, doi = {https://doi.org/10.1364/OL.44.003809}, year = {2019}, date = {2019-07-02}, journal = {Optics Letters}, volume = {44}, number = {15}, pages = {3809-3812}, abstract = {We present an approach for the study and design of reflectors with rotational or translational symmetry that redirect light from a point source into any desired radiant intensity distribution. This method is based on a simple conformal map that transforms the reflector’s shape into a curve that describes light’s direction after reflection. Both segmented reflectors and continuous reflectors are discussed, illustrating how certain reflector characteristics become apparent under this transformation. This method can also be used to study extended sources via translations.}, keywords = {design, related}, pubstate = {published}, tppubtype = {article} } We present an approach for the study and design of reflectors with rotational or translational symmetry that redirect light from a point source into any desired radiant intensity distribution. This method is based on a simple conformal map that transforms the reflector’s shape into a curve that describes light’s direction after reflection. Both segmented reflectors and continuous reflectors are discussed, illustrating how certain reflector characteristics become apparent under this transformation. This method can also be used to study extended sources via translations. | |
| Bauer, A; Pesch, M; Muschaweck, J; Leupelt, F; Rolland, J P All-Reflective Freeform Viewfinder Conference OSA Technical Digest, (FM2B.4), OSA, 2019. Abstract | Links | BibTeX | Tags: CeFO related @conference{ARRI_FF19, title = {All-Reflective Freeform Viewfinder}, author = {A. Bauer and M. Pesch and J. Muschaweck and F. Leupelt and J. P. Rolland}, doi = {https://doi.org/10.1364/FREEFORM.2019.FM2B.4}, year = {2019}, date = {2019-06-14}, booktitle = {OSA Technical Digest}, number = {FM2B.4}, publisher = {OSA}, abstract = {An all-reflective electronic viewfinder was designed using tilted freeform surfaces in a fully unobscured package. Tight distortion and telecentricity requirements moved the design from a two-mirror solution to a five-mirror solution.}, keywords = {CeFO related}, pubstate = {published}, tppubtype = {conference} } An all-reflective electronic viewfinder was designed using tilted freeform surfaces in a fully unobscured package. Tight distortion and telecentricity requirements moved the design from a two-mirror solution to a five-mirror solution. |
Michalko, A M; Fienup, J R Development of a Convex Surface Measurement Using Prescription Retrieval Conference OSA Technical Digest, (JW2A.7), OSA, 2019, ISBN: 978-1-943580-60-6. Abstract | Links | BibTeX | Tags: CEFO metrology, CeFO related @conference{Michalko2019osa, title = {Development of a Convex Surface Measurement Using Prescription Retrieval}, author = {A. M. Michalko and J. R. Fienup}, url = {https://doi.org/10.1364/FREEFORM.2019.JW2A.7}, isbn = {978-1-943580-60-6}, year = {2019}, date = {2019-06-12}, booktitle = {OSA Technical Digest}, number = {JW2A.7}, publisher = {OSA}, abstract = {The test geometry for a subaperture-scanning measurement technique for convex optical surfaces is discussed. Preliminary simulations of a convex spherical measurement using a prescription retrieval algorithm are demonstrated.}, keywords = {CEFO metrology, CeFO related}, pubstate = {published}, tppubtype = {conference} } The test geometry for a subaperture-scanning measurement technique for convex optical surfaces is discussed. Preliminary simulations of a convex spherical measurement using a prescription retrieval algorithm are demonstrated. | |
 | DeMars, L A; Falaggis, K; Porras-Aguilar, R Calibration of an SLM using Geometric Phase Interferometry Journal Article RIAO-OPTILAS-MOPM, 2019. BibTeX | Tags: CEFO metrology, CeFO related @article{DeMars_01, title = {Calibration of an SLM using Geometric Phase Interferometry}, author = {L. A. DeMars and K. Falaggis and R. Porras-Aguilar }, year = {2019}, date = {2019-06-01}, journal = {RIAO-OPTILAS-MOPM}, keywords = {CEFO metrology, CeFO related}, pubstate = {published}, tppubtype = {article} } |
Mishchik, Konstantin; Bonamis, Guillaume; Qiao, Jie; Lopez, John; Audouard, Eric; Mottay, Eric; Hönninger, Clemens; Manek-Hönninger, Inka High-efficiency femtosecond ablation of silicon with GHz repetition rate laser source Journal Article Opt. Lett., 44 (9), pp. 2193-2196, 2019. Abstract | BibTeX | Tags: CeFO related, manufacturing @article{Mishchik2019, title = {High-efficiency femtosecond ablation of silicon with GHz repetition rate laser source}, author = {Konstantin Mishchik and Guillaume Bonamis and Jie Qiao and John Lopez and Eric Audouard and Eric Mottay and Clemens Hönninger and Inka Manek-Hönninger}, year = {2019}, date = {2019-05-01}, journal = {Opt. Lett.}, volume = {44}, number = {9}, pages = {2193-2196}, abstract = {We report on silicon ablation with a 20 W GHz amplified femtosecond laser source. This novel laser delivers burst energies up to 400 μJ, providing flexible intra-pulse repetition rates of 0.88 or 3.52 GHz, up to 200 pulses with ∼350 fs pulse duration. High-efficiency, high-quality ablation can be achieved through optimally determining the number of pulses, intra-pulse repetition, and average pulse energy within a burst. Due to such optimization, we demonstrate a specific ablation rate of 2.5 mm3∕ min ∕W with a burst containing 200 pulses at 0.88 GHz, which is the highest one reported so far for fs laser ablation, to the best of our knowledge. GHz ablation is sensitive to the selection of laser parameters. We conceptually discuss the contributions of the pulses within a burst to heat-accumulation-based incubation and material ablation.}, keywords = {CeFO related, manufacturing}, pubstate = {published}, tppubtype = {article} } We report on silicon ablation with a 20 W GHz amplified femtosecond laser source. This novel laser delivers burst energies up to 400 μJ, providing flexible intra-pulse repetition rates of 0.88 or 3.52 GHz, up to 200 pulses with ∼350 fs pulse duration. High-efficiency, high-quality ablation can be achieved through optimally determining the number of pulses, intra-pulse repetition, and average pulse energy within a burst. Due to such optimization, we demonstrate a specific ablation rate of 2.5 mm3∕ min ∕W with a burst containing 200 pulses at 0.88 GHz, which is the highest one reported so far for fs laser ablation, to the best of our knowledge. GHz ablation is sensitive to the selection of laser parameters. We conceptually discuss the contributions of the pulses within a burst to heat-accumulation-based incubation and material ablation. | |
 | LUIS A. ALEMÁN-CASTANEDA BRUNO PICCIRILLO, ENRICO SANTAMATO LORENZO MARRUCCI ; ALONSO, MIGUEL A Shearing interferometry via geometric phase Journal Article Optica, 6 (4), pp. 396-399, 2019. Abstract | Links | BibTeX | Tags: metrology, related @article{ALEMÁN-CASTANEDA2019, title = {Shearing interferometry via geometric phase}, author = {LUIS A. ALEMÁN-CASTANEDA, BRUNO PICCIRILLO, ENRICO SANTAMATO, LORENZO MARRUCCI, AND MIGUEL A. ALONSO}, url = {https://doi.org/10.1364/OPTICA.6.000396}, doi = {10.1364/OPTICA.6.000396}, year = {2019}, date = {2019-03-21}, journal = {Optica}, volume = {6}, number = {4}, pages = {396-399}, abstract = {We propose an approach based on geometric phase for per- forming several types of shearing interferometry through a ro- bust, compact, common-path setup. The key elements are two identical parallel plates with spatially varying birefringence distributions, which perform the shearing by writing opposite geometric phases on the two circular polarization components of the linearly polarized incident wavefront. This setup allows the independent control of the shearing magnitude and rela- tive phase of the two wavefront replicas. The approach is first illustrated for the simplest case of lateral shearing, and then extended to other geometries where the magnitude and direc- tion of the shear vary smoothly over the wavefront.}, keywords = {metrology, related}, pubstate = {published}, tppubtype = {article} } We propose an approach based on geometric phase for per- forming several types of shearing interferometry through a ro- bust, compact, common-path setup. The key elements are two identical parallel plates with spatially varying birefringence distributions, which perform the shearing by writing opposite geometric phases on the two circular polarization components of the linearly polarized incident wavefront. This setup allows the independent control of the shearing magnitude and rela- tive phase of the two wavefront replicas. The approach is first illustrated for the simplest case of lateral shearing, and then extended to other geometries where the magnitude and direc- tion of the shear vary smoothly over the wavefront. |
2018 |
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 | Feng, T; Qiao, J A novel pump-probe microscope for measuring the dynamics of plasma and surface structuring by femtosecond lasers Conference ICALEO 37th International Congress on Applications of Lasers & Electro-Optics, Paper LMF 5, 2018. BibTeX | Tags: CeFO related, manufacturing @conference{LaurenICALEO18b, title = {A novel pump-probe microscope for measuring the dynamics of plasma and surface structuring by femtosecond lasers}, author = {T. Feng and J. Qiao}, year = {2018}, date = {2018-10-14}, booktitle = {ICALEO 37th International Congress on Applications of Lasers & Electro-Optics, Paper LMF 5}, keywords = {CeFO related, manufacturing}, pubstate = {published}, tppubtype = {conference} } |
Schiesser, Eric M; Bahk, Seung-Whan; Bromage, Jake; Rolland, Jannick P Gaussian curvature and stigmatic imaging relations for the design of an unobscured reflective relay Journal Article Optics Letters, (20), pp. 4855-4858, 2018. Abstract | Links | BibTeX | Tags: CeFO related, design @article{Schiesser2018, title = {Gaussian curvature and stigmatic imaging relations for the design of an unobscured reflective relay}, author = {Eric M. Schiesser and Seung-Whan Bahk and Jake Bromage and Jannick P. Rolland}, url = {https://doi.org/10.1364/OL.43.004855}, doi = {10.1364/OL.43.004855}, year = {2018}, date = {2018-10-03}, journal = {Optics Letters}, number = {20}, pages = {4855-4858}, abstract = {We derive the relationship between Coddington's equations and the Gaussian curvature for a stigmatic reflective imaging system. This relationship allows parameterizing off-axis conic optical systems using traditional first-order optics by considering the effective curvature at the center of the off-axis sections. Specifically, we demonstrate parameterizing the system requirements of a 2{\texttimes} achromatic image relay for a terawatt laser system. This system required both collimation (far-field) and pupil imaging (near-field) simultaneously. Long working distances and specific spatial constraints limited the available layout options for the imaging components. By parameterizing these system requirements and packaging constraints, the final specifications could be quickly iterated, while allowing for flexibility in the layout of the system during a multi-year conceptual period.}, keywords = {CeFO related, design}, pubstate = {published}, tppubtype = {article} } We derive the relationship between Coddington's equations and the Gaussian curvature for a stigmatic reflective imaging system. This relationship allows parameterizing off-axis conic optical systems using traditional first-order optics by considering the effective curvature at the center of the off-axis sections. Specifically, we demonstrate parameterizing the system requirements of a 2{texttimes} achromatic image relay for a terawatt laser system. This system required both collimation (far-field) and pupil imaging (near-field) simultaneously. Long working distances and specific spatial constraints limited the available layout options for the imaging components. By parameterizing these system requirements and packaging constraints, the final specifications could be quickly iterated, while allowing for flexibility in the layout of the system during a multi-year conceptual period. | |
 | Qiao, J Differentiating non-thermal ablation and heat accumulation toward ablation-cooled ultrafast-laser processing Conference The 19th International Symposium on Laser Precision Microfabrication, Edinburgh, UK, 2018. BibTeX | Tags: CeFO related, manufacturing @conference{LaurenTalk18, title = {Differentiating non-thermal ablation and heat accumulation toward ablation-cooled ultrafast-laser processing}, author = {J. Qiao}, year = {2018}, date = {2018-06-25}, booktitle = {The 19th International Symposium on Laser Precision Microfabrication, Edinburgh, UK}, keywords = {CeFO related, manufacturing}, pubstate = {published}, tppubtype = {conference} } |
Papa, Jonathan C; Howard, J; Rolland, J P Starting point designs for freeform four-mirror systems Journal Article Optical Engineering, 57 (10), pp. 101705, 2018. Abstract | Links | BibTeX | Tags: CeFO related, design @article{Papa_IODC2017, title = {Starting point designs for freeform four-mirror systems}, author = {Jonathan C. Papa and J. Howard and J. P. Rolland}, url = {https://doi.org/10.1117/1.OE.57.10.101705}, doi = {10.1117/1.OE.57.10.101705}, year = {2018}, date = {2018-06-21}, journal = {Optical Engineering}, volume = {57}, number = {10}, pages = {101705}, abstract = {Driven by the development of freeform four-mirror solutions, we review and compare analytical methods to generate starting point designs with various states of correction, surface types, symmetry, and obscuration. The advantages and disadvantages of each are examined. We have combined several concepts and techniques from the literature to analytically generate unobscured freeform starting point designs that are corrected through the third-order image degrading aberrations. The surfaces in these starting point designs are described as base off-axis conics that image stigmatically for the central field point, also known as Cartesian reflectors, with an aspheric departure “cap” (quartic with the aperture) added to the Cartesian reflectors. Tilt angles are chosen to cancel field-asymmetric field-linear astigmatism and unobscure the system. Paraxial data from an equivalent on-axis system are used to solve a system of linear equations to determine the magnitude of the aspheric departure “caps” that are placed on top of the base Cartesian reflectors, in order to eliminate the remaining third-order image degrading aberrations. In this approach, each aspheric departure “cap” is centered about the intersection of the optical-axis-ray, also known as the base ray, with the base surface, rather than being centered about the axis of rotational invariance.}, keywords = {CeFO related, design}, pubstate = {published}, tppubtype = {article} } Driven by the development of freeform four-mirror solutions, we review and compare analytical methods to generate starting point designs with various states of correction, surface types, symmetry, and obscuration. The advantages and disadvantages of each are examined. We have combined several concepts and techniques from the literature to analytically generate unobscured freeform starting point designs that are corrected through the third-order image degrading aberrations. The surfaces in these starting point designs are described as base off-axis conics that image stigmatically for the central field point, also known as Cartesian reflectors, with an aspheric departure “cap” (quartic with the aperture) added to the Cartesian reflectors. Tilt angles are chosen to cancel field-asymmetric field-linear astigmatism and unobscure the system. Paraxial data from an equivalent on-axis system are used to solve a system of linear equations to determine the magnitude of the aspheric departure “caps” that are placed on top of the base Cartesian reflectors, in order to eliminate the remaining third-order image degrading aberrations. In this approach, each aspheric departure “cap” is centered about the intersection of the optical-axis-ray, also known as the base ray, with the base surface, rather than being centered about the axis of rotational invariance. | |
 | Papa, J C; Howard, J M; Rolland, J P Three-mirror freeform imagers Proceeding SPIE Optical Systems Design VII, 10690 , 2018. Links | BibTeX | Tags: CeFO related @proceedings{Papa_spie2018, title = {Three-mirror freeform imagers}, author = {J. C. Papa and J. M. Howard and J. P. Rolland}, doi = {10.1117/12.2314403}, year = {2018}, date = {2018-06-21}, volume = {10690}, publisher = {SPIE Optical Systems Design VII}, keywords = {CeFO related}, pubstate = {published}, tppubtype = {proceedings} } |
 | Rolland, J P Engineering the ultimate augmented reality display: Paths towards a digital window into the world Miscellaneous 2018. Links | BibTeX | Tags: design, related @misc{RollandLFW, title = {Engineering the ultimate augmented reality display: Paths towards a digital window into the world}, author = {J. P. Rolland}, url = {http://digital.laserfocusworld.com/laserfocusworld/201806/MobilePagedArticle.action?articleId=1404125#articleId1404125}, year = {2018}, date = {2018-06-20}, issuetitle = {Laser Focus World}, volume = {June 2018}, pages = {31-34}, keywords = {design, related}, pubstate = {published}, tppubtype = {misc} } |
 | Dorrer, C; Qiao, J Direct binary search for improved beam shaping and optical differentiation wavefront sensing Journal Article Applied Optics, 57 (29) , pp. 8557-8565 , 2018. Links | BibTeX | Tags: CeFO related, manufacturing, related @article{LaurenApp18, title = {Direct binary search for improved beam shaping and optical differentiation wavefront sensing}, author = {C. Dorrer and J. Qiao}, doi = {https://www.osapublishing.org/ao/abstract.cfm?URI=ao-57-29-8557}, year = {2018}, date = {2018-06-01}, journal = {Applied Optics}, volume = {57 (29)}, pages = {8557-8565 }, keywords = {CeFO related, manufacturing, related}, pubstate = {published}, tppubtype = {article} } |
 | Yao, Jianing; Anderson, Alexander; Rolland, Jannick P Point-cloud noncontact metrology of freeform optical surfaces Journal Article Optics Express, 26 (8), pp. 10242-10265, 2018. Abstract | Links | BibTeX | Tags: metrology, related @article{yao18, title = {Point-cloud noncontact metrology of freeform optical surfaces}, author = {Jianing Yao and Alexander Anderson and Jannick P. Rolland}, url = {https://doi.org/10.1364/OE.26.010242}, doi = {10.1364/OE.26.010242}, year = {2018}, date = {2018-04-09}, journal = {Optics Express}, volume = {26}, number = {8}, pages = {10242-10265}, abstract = {In this paper, we demonstrate the development of a point-cloud metrology method for the noncontact, high resolution, high precision testing of freeform surfaces. The method leverages swept source optical coherence tomography together with a common-path setup in the sample arm configured to mitigate the axial jitter caused by scanning and environmental perturbations. The lateral x-y scanning field was also rigorously evaluated for the sampling step, linearity, straightness, and orthogonality. Based on the finely engineered system hardware, a comprehensive system model was developed capable of characterizing the vertical displacement sensitivity and lateral scanning noise. The model enables predicting the point-cloud surface-metrology uncertainty map of any freeform surface and guiding the selection of optimum experimental conditions. A system was then assembled and experimentally evaluated first with flat and spherical standards to demonstrate the measurement uncertainty. Results of measuring an Alvarez freeform surface with 400-µm peak-to-valley sag show 93 nm (< λ/14) precision and 128 nm (< λ/10) root-mean-square residual from the nominal shape. The high resolution measurements also reveal mid spatial frequency structures on the test part.}, keywords = {metrology, related}, pubstate = {published}, tppubtype = {article} } In this paper, we demonstrate the development of a point-cloud metrology method for the noncontact, high resolution, high precision testing of freeform surfaces. The method leverages swept source optical coherence tomography together with a common-path setup in the sample arm configured to mitigate the axial jitter caused by scanning and environmental perturbations. The lateral x-y scanning field was also rigorously evaluated for the sampling step, linearity, straightness, and orthogonality. Based on the finely engineered system hardware, a comprehensive system model was developed capable of characterizing the vertical displacement sensitivity and lateral scanning noise. The model enables predicting the point-cloud surface-metrology uncertainty map of any freeform surface and guiding the selection of optimum experimental conditions. A system was then assembled and experimentally evaluated first with flat and spherical standards to demonstrate the measurement uncertainty. Results of measuring an Alvarez freeform surface with 400-µm peak-to-valley sag show 93 nm (< λ/14) precision and 128 nm (< λ/10) root-mean-square residual from the nominal shape. The high resolution measurements also reveal mid spatial frequency structures on the test part. |
 | Zhao, Nan; Papa, Jonathan C; Fuerschbach, Kyle; Qiao, Yanfeng; Thompson, Kevin P; Rolland, Jannick P Experimental investigation in nodal aberration theory (NAT) with a customized Ritchey-Chrétien system: third-order coma Journal Article Optics Express, 26 (7), pp. 8729-8743, 2018. Abstract | Links | BibTeX | Tags: metrology, related @article{nanzhao18, title = {Experimental investigation in nodal aberration theory (NAT) with a customized Ritchey-Chrétien system: third-order coma}, author = {Nan Zhao and Jonathan C. Papa and Kyle Fuerschbach and Yanfeng Qiao and Kevin P. Thompson and Jannick P. Rolland}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-26-7-8729}, doi = {10.1364/OE.26.008729}, year = {2018}, date = {2018-04-02}, journal = {Optics Express}, volume = {26}, number = {7}, pages = {8729-8743}, abstract = {Nodal aberration theory (NAT) describes the aberration properties of optical systems without symmetry. NAT was fully described mathematically and investigated through real-ray tracing software, but an experimental investigation is yet to be realized. In this study, a two-mirror Ritchey-Chrétien telescope was designed and built, including testing of the mirrors in null configurations, for experimental investigation of NAT. A feature of this custom telescope is a high-precision hexapod that controls the secondary mirror of the telescope to purposely introduce system misalignments and quantify the introduced aberrations interferometrically. A method was developed to capture interferograms for multiple points across the field of view without moving the interferometer. A simulation result of Fringe Zernike coma was generated and analyzed to provide a direct comparison with the experimental results. A statistical analysis of the measurements was conducted to assess residual differences between simulations and experimental results. The interferograms were consistent with the simulations, thus experimentally validating NAT for third-order coma.}, keywords = {metrology, related}, pubstate = {published}, tppubtype = {article} } Nodal aberration theory (NAT) describes the aberration properties of optical systems without symmetry. NAT was fully described mathematically and investigated through real-ray tracing software, but an experimental investigation is yet to be realized. In this study, a two-mirror Ritchey-Chrétien telescope was designed and built, including testing of the mirrors in null configurations, for experimental investigation of NAT. A feature of this custom telescope is a high-precision hexapod that controls the secondary mirror of the telescope to purposely introduce system misalignments and quantify the introduced aberrations interferometrically. A method was developed to capture interferograms for multiple points across the field of view without moving the interferometer. A simulation result of Fringe Zernike coma was generated and analyzed to provide a direct comparison with the experimental results. A statistical analysis of the measurements was conducted to assess residual differences between simulations and experimental results. The interferograms were consistent with the simulations, thus experimentally validating NAT for third-order coma. |
 | Taylor, L; Qiao, J Predicting Ablation-Cooled Gigahertz Ultrafast Laser Processing via Integrated Modeling Conference ICALEO 37th International Congress on Applications of Lasers & Electro-Optics, Paper LMF 6, 2018. BibTeX | Tags: CeFO related, manufacturing @conference{LaurenICALEO18, title = {Predicting Ablation-Cooled Gigahertz Ultrafast Laser Processing via Integrated Modeling}, author = {L. Taylor and J. Qiao}, year = {2018}, date = {2018-03-14}, booktitle = {ICALEO 37th International Congress on Applications of Lasers & Electro-Optics, Paper LMF 6}, keywords = {CeFO related, manufacturing}, pubstate = {published}, tppubtype = {conference} } |
 | Taylor, L L; Scott, R E; Qiao, J Integrating two-temperature and classical heat accumulation models to predict femtosecond laser processing of silicon Journal Article Optical Materials Express, 8 (3), pp. 648-658, 2018. Links | BibTeX | Tags: CeFO related, manufacturing @article{QiaoOMEX18, title = {Integrating two-temperature and classical heat accumulation models to predict femtosecond laser processing of silicon}, author = {L. L. Taylor and R. E. Scott and J. Qiao }, doi = {https://www.osapublishing.org/ome/abstract.cfm?URI=ome-8-3-648}, year = {2018}, date = {2018-03-01}, journal = {Optical Materials Express}, volume = {8}, number = {3}, pages = {648-658}, keywords = {CeFO related, manufacturing}, pubstate = {published}, tppubtype = {article} } |
2017 |
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 | Papa, J; Howard, J M; Rolland, J P Four-Mirror Freeform Design Conference Mirror Tech/SBIR/STTR Workshop 2017, 2017. Links | BibTeX | Tags: CeFO related, design, related @conference{Papa_nasa, title = {Four-Mirror Freeform Design}, author = {J. Papa and J. M. Howard and J. P. Rolland}, url = {https://spie.org/Documents/ConferencesExhibitions/Tech-Days-2017-Presentations-DRAFT.pdf}, year = {2017}, date = {2017-11-15}, booktitle = {Mirror Tech/SBIR/STTR Workshop 2017}, keywords = {CeFO related, design, related}, pubstate = {published}, tppubtype = {conference} } |
 | Lambropoulos, John C Twyman effects in thin curved optics Proceeding SPIE, SPIE Vol 10448 (104480V (2017)), 2017. Abstract | Links | BibTeX | Tags: CeFO related, metrology @proceedings{Lambropoulos172, title = {Twyman effects in thin curved optics}, author = {John C. Lambropoulos}, editor = {Julie L. Bentley; Sebastian Stoebenau}, url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10448/104480V/Twyman-effects-in-thin-curved-optics/10.1117/12.2279833.short}, year = {2017}, date = {2017-10-20}, volume = {SPIE Vol 10448}, number = {104480V (2017)}, publisher = {SPIE}, series = {Optifab}, abstract = {The Twyman effect refers to the fact that, when a thin optical plate has one side ground, the plate bends with the ground side becoming convex, i.e. as if the ground side is in a residual compressive stress. Such deformation often shows up as “power” on form measurements of the other (usually polished) plate surface. For thin flat optics, Twyman effects become important at aspect ratios of 1:25 or thinner. In this case, the optic bends throughout its surface with a constant curvature, i.e. bending extends over the whole surface. Here we discuss Twyman effects for mildly or highly curved thin axisymmetric optics such as cylinders, spheres, and shallow lenses or mirrors. We also outline extensions to more complex geometries, such as ogives. We show that the deformation in thin curved optics is significantly different from flat plates: In curved optics, deformation consists of a simple stretching contribution, valid over the largest portion of the optic, plus a complex, spatially-dependent bending contribution in a boundary layer, valid near the free edges of the optic. }, keywords = {CeFO related, metrology}, pubstate = {published}, tppubtype = {proceedings} } The Twyman effect refers to the fact that, when a thin optical plate has one side ground, the plate bends with the ground side becoming convex, i.e. as if the ground side is in a residual compressive stress. Such deformation often shows up as “power” on form measurements of the other (usually polished) plate surface. For thin flat optics, Twyman effects become important at aspect ratios of 1:25 or thinner. In this case, the optic bends throughout its surface with a constant curvature, i.e. bending extends over the whole surface. Here we discuss Twyman effects for mildly or highly curved thin axisymmetric optics such as cylinders, spheres, and shallow lenses or mirrors. We also outline extensions to more complex geometries, such as ogives. We show that the deformation in thin curved optics is significantly different from flat plates: In curved optics, deformation consists of a simple stretching contribution, valid over the largest portion of the optic, plus a complex, spatially-dependent bending contribution in a boundary layer, valid near the free edges of the optic. |
 | Papa, J; Howard, J M; Rolland, J P Starting Point Designs for Freeform Four-Mirror Systems Conference Proceedings of the International Optical Design Conference 2017, Optical Society of America, 2017, ISBN: 978-1-943580-31-6. Links | BibTeX | Tags: design, related @conference{PapaIODC17, title = {Starting Point Designs for Freeform Four-Mirror Systems}, author = {J. Papa and J. M. Howard and J. P. Rolland}, url = {https://doi.org/10.1364/IODC.2017.ITu2A.4}, doi = {10.1364/IODC.2017.ITu2A.4}, isbn = {978-1-943580-31-6}, year = {2017}, date = {2017-07-13}, booktitle = {Proceedings of the International Optical Design Conference 2017}, publisher = {Optical Society of America}, keywords = {design, related}, pubstate = {published}, tppubtype = {conference} } |
 | Shultz, J A; Davies, M; Suleski, T J Simplified Tolerancing of Alignment Errors in Dynamic Freeform Optical Systems Conference Freeform 2017 (Freeform, IODC, OFT), Optical Society of America, 2017. Abstract | Links | BibTeX | Tags: assembly, related @conference{Suleski17_1, title = {Simplified Tolerancing of Alignment Errors in Dynamic Freeform Optical Systems}, author = {J. A. Shultz and M. Davies and T. J. Suleski}, url = {https://doi.org/10.1364/FREEFORM.2017.JTh1C.3}, doi = {10.1364/FREEFORM.2017.JTh1C.3}, year = {2017}, date = {2017-07-13}, booktitle = {Freeform 2017 (Freeform, IODC, OFT)}, publisher = {Optical Society of America}, abstract = {We discuss and demonstrate approaches for analyzing and quantifying the sensitivity of dynamic freeform optical systems to positioning errors, and the resulting impacts on optical performance. Imaging and non-imaging examples are considered.}, keywords = {assembly, related}, pubstate = {published}, tppubtype = {conference} } We discuss and demonstrate approaches for analyzing and quantifying the sensitivity of dynamic freeform optical systems to positioning errors, and the resulting impacts on optical performance. Imaging and non-imaging examples are considered. |
 | Shultz, J A; Suleski, T J Design of a Variable Toric Lens Using Laterally Shifted Freeform Elements Conference Freeform 2017 (Freeform, IODC, OFT), Optical Society of America, 2017. Links | BibTeX | Tags: design, related @conference{Suleski17_2, title = {Design of a Variable Toric Lens Using Laterally Shifted Freeform Elements}, author = {J. A. Shultz and T. J. Suleski }, url = {https://doi.org/10.1364/FREEFORM.2017.JW2C.2}, doi = {0.1364/FREEFORM.2017.JW2C.2}, year = {2017}, date = {2017-07-13}, booktitle = {Freeform 2017 (Freeform, IODC, OFT)}, publisher = {Optical Society of America}, keywords = {design, related}, pubstate = {published}, tppubtype = {conference} } |
| Liang, Kevin; Alonso, Miguel A MTF as the Fourier Transform of a Pupil-Difference Probability Density Presentation 09.07.2017, (Freeform Optics 2017 Denver, Colorado United States 9–13 July 2017). Abstract | Links | BibTeX | Tags: CeFO design @misc{Alonso2017, title = {MTF as the Fourier Transform of a Pupil-Difference Probability Density}, author = {Kevin Liang and Miguel A. Alonso}, editor = {Optical Society of America}, url = {https://doi.org/10.1364/FREEFORM.2017.JTu1C.4}, doi = {https://doi.org/10.1364/FREEFORM.2017.JTu1C.4}, isbn = { 978-1-943580-31-6}, year = {2017}, date = {2017-07-09}, abstract = {We develop the theory for calculating the effects of mid-spatial frequency structures on the modulation transfer function through the Fourier transform of a pupil-difference probability density function. Its implementation is shown for several periodic groove.}, note = {Freeform Optics 2017 Denver, Colorado United States 9–13 July 2017}, keywords = {CeFO design}, pubstate = {published}, tppubtype = {presentation} } We develop the theory for calculating the effects of mid-spatial frequency structures on the modulation transfer function through the Fourier transform of a pupil-difference probability density function. Its implementation is shown for several periodic groove. |
 | Qiao, J; Dorrer, C Measuring wavefront by optical differentiation with binary pixelated filters Proceeding Optical Society of America, Imaging and Applied Optics, 2017. Links | BibTeX | Tags: CeFO related, manufacturing @proceedings{QiaoImgApplOpt17, title = {Measuring wavefront by optical differentiation with binary pixelated filters}, author = {J. Qiao and C. Dorrer}, url = {http://www.osapublishing.org/abstract.cfm?URI=ISA-2017-ITu4E.3}, doi = {10.1364/ISA.2017.ITu4E.3}, year = {2017}, date = {2017-06-26}, pages = {ITu4E.3}, publisher = {Optical Society of America, Imaging and Applied Optics}, keywords = {CeFO related, manufacturing}, pubstate = {published}, tppubtype = {proceedings} } |
 | Scott, R E; Taylor, L L; Qiao, J Conference on Lasers and Electro-Optics (CLEO), Optical Society of America, 2017. Links | BibTeX | Tags: CeFO related, manufacturing @proceedings{QiaoCLEO17, title = {Comparison of Two-Temperature and Thermal Models for Prediction of the Optimal Femtosecond Laser-Material Processing of Silicon}, author = {R. E. Scott and L. L. Taylor and J. Qiao}, url = {http://www.osapublishing.org/abstract.cfm?URI=CLEO_AT-2017-ATu4C.5}, doi = {10.1364/CLEO_AT.2017.ATu4C.5}, year = {2017}, date = {2017-05-14}, pages = {ATu4C.5}, publisher = {Conference on Lasers and Electro-Optics (CLEO), Optical Society of America}, keywords = {CeFO related, manufacturing}, pubstate = {published}, tppubtype = {proceedings} } |
| ANTHONY VELLA HIPPOLYTE DOURDENT, LUKAS NOVOTNY ; ALONSO, MIGUEL A Birefringent masks that are optimal for generating bottle fields Journal Article Optics Express, 25 (8), pp. 9318-9332, 2017. Abstract | Links | BibTeX | Tags: design, related @article{AlonsoVella2017, title = {Birefringent masks that are optimal for generating bottle fields}, author = {ANTHONY VELLA, HIPPOLYTE DOURDENT, LUKAS NOVOTNY, AND MIGUEL A. ALONSO}, editor = {OSA}, doi = {https://doi.org/10.1364/OE.25.009318}, year = {2017}, date = {2017-04-17}, journal = {Optics Express}, volume = {25}, number = {8}, pages = {9318-9332}, abstract = {An optical bottle field containing a three-dimensional intensity null at the focal point can be generated by placing a spatially inhomogeneous birefringent mask at the pupil of an aplanatic high-NA focusing system. We derive the optimal birefringence distribution for which a uniformly polarized input beam is converted into a bottle field with the sharpest possible null in intensity. We show that a stress engineered optical (SEO) window, which has a radially varying retardance, followed by a half-wave plate, performs nearly as well as the optimal solution. Experimental results corroborate that an SEO element can be used to generate a bottle field.}, keywords = {design, related}, pubstate = {published}, tppubtype = {article} } An optical bottle field containing a three-dimensional intensity null at the focal point can be generated by placing a spatially inhomogeneous birefringent mask at the pupil of an aplanatic high-NA focusing system. We derive the optimal birefringence distribution for which a uniformly polarized input beam is converted into a bottle field with the sharpest possible null in intensity. We show that a stress engineered optical (SEO) window, which has a radially varying retardance, followed by a half-wave plate, performs nearly as well as the optimal solution. Experimental results corroborate that an SEO element can be used to generate a bottle field. |
 | Shultz, J A; Smilie, P J; Davies, M A; Suleski, T J Optomechanical tolerancing of dynamic freeform optical systems Conference Proceedings ASPE/ASPEN Spring Topical Meeting: Manufacture and Metrology of Structured and Freeform Surfaces for Functional Applications, ASPE/ASPEN, 2017, (Proceedings of ASPE/ASPEN Spring Topical Meeting). BibTeX | Tags: assembly, related @conference{Suleski17_4, title = {Optomechanical tolerancing of dynamic freeform optical systems}, author = {J. A. Shultz and P. J. Smilie and M. A. Davies and T. J. Suleski}, year = {2017}, date = {2017-03-16}, booktitle = {Proceedings ASPE/ASPEN Spring Topical Meeting: Manufacture and Metrology of Structured and Freeform Surfaces for Functional Applications}, publisher = {ASPE/ASPEN}, note = {Proceedings of ASPE/ASPEN Spring Topical Meeting}, keywords = {assembly, related}, pubstate = {published}, tppubtype = {conference} } |
2016 |
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 | Xu, Di; Yao, Jianing; Zhao, Nan; Rolland, Jannick P Optical Society of America, 2016, ISBN: 978-1-943580-19-4, (The CEFO project relevant portions were not included in the proceeding but were presented directly at the conference. Presentation slides are available upon request. ). Links | BibTeX | Tags: related, testing @conference{Xu2016, title = {Scanning Customized Swept-source Optical Coherence Tomography (SS-OCT) for the Metrology of Freeform Optical Surfaces}, author = {Di Xu and Jianing Yao and Nan Zhao and Jannick P. Rolland}, url = {https://doi.org/10.1364/FIO.2016.FW5H.6}, doi = {10.1364/FIO.2016.FW5H.6}, isbn = {978-1-943580-19-4}, year = {2016}, date = {2016-10-17}, publisher = {Optical Society of America}, note = {The CEFO project relevant portions were not included in the proceeding but were presented directly at the conference. Presentation slides are available upon request. }, keywords = {related, testing}, pubstate = {published}, tppubtype = {conference} } |
| Moore, D B; Fienup, J R Ptychography for optical metrology with limited translation knowledge Journal Article Applied Optics, 55 (17), pp. 4596-4610, 2016. Abstract | Links | BibTeX | Tags: related, testing @article{Fienup16, title = {Ptychography for optical metrology with limited translation knowledge}, author = {Moore, D. B. and J. R. Fienup}, url = {https://www.osapublishing.org/ao/abstract.cfm?uri=ao-55-17-4596}, year = {2016}, date = {2016-06-07}, journal = {Applied Optics}, volume = {55}, number = {17}, pages = {4596-4610}, abstract = {We introduce unknown-transverse translation diversity phase retrieval: a ptychographic algorithm for optical metrology when a subaperture is translating through a plane conjugate to the exit pupil in a very poorly known fashion. The algorithm estimates the direction of translation and the distance traveled by the subaperture from one point spread function (PSF) to the next. It also estimates unknown point target motion and rotations of the subaperture between PSF acquisitions from the PSF data.}, keywords = {related, testing}, pubstate = {published}, tppubtype = {article} } We introduce unknown-transverse translation diversity phase retrieval: a ptychographic algorithm for optical metrology when a subaperture is translating through a plane conjugate to the exit pupil in a very poorly known fashion. The algorithm estimates the direction of translation and the distance traveled by the subaperture from one point spread function (PSF) to the next. It also estimates unknown point target motion and rotations of the subaperture between PSF acquisitions from the PSF data. |
 | Shahinian, H; Cherukuri, H; Mullany, B An Evaluation of Fiber-Based Tools for Glass Polishing Using Experimental and Computational Approaches Journal Article Applied Optics, 45 (16), pp. 4307-4316, 2016. Abstract | BibTeX | Tags: CeFO manufacturing @article{Shahinian16, title = {An Evaluation of Fiber-Based Tools for Glass Polishing Using Experimental and Computational Approaches}, author = {Shahinian, H. and H. Cherukuri and B. Mullany}, year = {2016}, date = {2016-06-01}, journal = {Applied Optics}, volume = {45}, number = {16}, pages = {4307-4316}, abstract = {Polymeric pad or pitch-based tools combined with loose abrasive slurries are typically used in the polishing of optical materials. In this paper, the potential of fiber-based tools to both remove material and provide high quality surface finishes on BK7 glass is explored. The potential advantage of fiber-based tools over traditional tools is their inherent compliance, which could accommodate varying workpiece surface curvatures as found in aspheres and freeforms. To evaluate the new tools, both experimental and finite element (FE) modeling approaches were taken. A FE model consisting of a single fiber engaged with the workpiece surface was used to estimate the shape and magnitude of the pressure distribution exerted by the fiber on the workpiece surface. Two different tool configurations, yielding two different Fes, predicted pressure distributions, were used to polish BK7 samples, and the material removal profiles were interferometrically measured. The resulting profiles and the predicted pressure distributions share the same v-shape. While differences in scale exist between the experimental and FE-predicted profiles, the tool generating higher material removal had the greater predicted pressure distribution, thus demonstrating the ability of the FE model to provide insights into tool design. Additional testing was conducted to determine if the tool’s removal rate can be predicted by Preston’s equation. Initial results indicate the equation is valid within the range of parameters tested. The surface roughness of BK7 samples processed by this tool was measured and some deterioration on the Sq value was noted; the surface roughness increased from 1.89 to 3.66 nm Sq. Over several hours of continuous use, the load applied by the fibers decays in a repeatable manner, and little wear was observed on the fibers after 5.33 h of polishing.}, keywords = {CeFO manufacturing}, pubstate = {published}, tppubtype = {article} } Polymeric pad or pitch-based tools combined with loose abrasive slurries are typically used in the polishing of optical materials. In this paper, the potential of fiber-based tools to both remove material and provide high quality surface finishes on BK7 glass is explored. The potential advantage of fiber-based tools over traditional tools is their inherent compliance, which could accommodate varying workpiece surface curvatures as found in aspheres and freeforms. To evaluate the new tools, both experimental and finite element (FE) modeling approaches were taken. A FE model consisting of a single fiber engaged with the workpiece surface was used to estimate the shape and magnitude of the pressure distribution exerted by the fiber on the workpiece surface. Two different tool configurations, yielding two different Fes, predicted pressure distributions, were used to polish BK7 samples, and the material removal profiles were interferometrically measured. The resulting profiles and the predicted pressure distributions share the same v-shape. While differences in scale exist between the experimental and FE-predicted profiles, the tool generating higher material removal had the greater predicted pressure distribution, thus demonstrating the ability of the FE model to provide insights into tool design. Additional testing was conducted to determine if the tool’s removal rate can be predicted by Preston’s equation. Initial results indicate the equation is valid within the range of parameters tested. The surface roughness of BK7 samples processed by this tool was measured and some deterioration on the Sq value was noted; the surface roughness increased from 1.89 to 3.66 nm Sq. Over several hours of continuous use, the load applied by the fibers decays in a repeatable manner, and little wear was observed on the fibers after 5.33 h of polishing. |
| Salzman, S Optimal magnetorheological fluid for finishing of CVD zinc sulfide PhD Thesis University of Rochester, 2016. Abstract | BibTeX | Tags: manufacturing, related @phdthesis{Salzman2016, title = {Optimal magnetorheological fluid for finishing of CVD zinc sulfide}, author = {Salzman, S.}, year = {2016}, date = {2016-06-01}, address = {Department of mechanical Engineering}, school = {University of Rochester}, abstract = {Magnetorheological finishing (MRF) of polycrystalline, chemical-vapor-deposited zinc sulfide (ZnS) optics tends to leave visible surface artifacts known as “pebbles”. These artifacts are a direct result of the material’s inner structure that consists of cone-like features that grow larger (up to a few millimeters in size) as deposition takes place, and manifest on the top deposited surface as pebbles. Polishing the pebble features from a CVD ZnS substrate to a flat surface and smooth to below 10 nm root-mean-square) is challenging, especially for a non-destructive polishing process such as MRF. This work explores ways to improve the surface finish of CVD ZnS processed with MRF through modification of the magnetorheological (MR) fluid’s properties. A materials science approach is presented to define the anisotropy of CVD ZnS through a combination of chemical and mechanical experiments and theoretical predictions. Magnetorheological finishing experiments with single crystal samples of ZnS, whose cuts and orientations represent most of the facets known to occur in the polycrystalline CVD ZnS, were performed to explore the influence of material anisotropy on the material removal rate during MRF. By adjusting fluid’s viscosity, abrasive type concentration, and fluid’s pH to find the chemo-mechanical conditions that equalize removal rates among all single crystal facets during MRF, we came up with an optimized, novel MR formulation to polish CVD ZnS without degrading the surface finish of the optic.}, type = {related}, keywords = {manufacturing, related}, pubstate = {published}, tppubtype = {phdthesis} } Magnetorheological finishing (MRF) of polycrystalline, chemical-vapor-deposited zinc sulfide (ZnS) optics tends to leave visible surface artifacts known as “pebbles”. These artifacts are a direct result of the material’s inner structure that consists of cone-like features that grow larger (up to a few millimeters in size) as deposition takes place, and manifest on the top deposited surface as pebbles. Polishing the pebble features from a CVD ZnS substrate to a flat surface and smooth to below 10 nm root-mean-square) is challenging, especially for a non-destructive polishing process such as MRF. This work explores ways to improve the surface finish of CVD ZnS processed with MRF through modification of the magnetorheological (MR) fluid’s properties. A materials science approach is presented to define the anisotropy of CVD ZnS through a combination of chemical and mechanical experiments and theoretical predictions. Magnetorheological finishing experiments with single crystal samples of ZnS, whose cuts and orientations represent most of the facets known to occur in the polycrystalline CVD ZnS, were performed to explore the influence of material anisotropy on the material removal rate during MRF. By adjusting fluid’s viscosity, abrasive type concentration, and fluid’s pH to find the chemo-mechanical conditions that equalize removal rates among all single crystal facets during MRF, we came up with an optimized, novel MR formulation to polish CVD ZnS without degrading the surface finish of the optic. |
 | Huang, J; Hindman, H B; Rolland, J P In vivo thickness dynamics measurement of tear film lipid and aqueous layers with optical coherence tomography and maximum-likelihood estimation Journal Article Optics Letters, 41 (9), pp. 1981-1984 , 2016. BibTeX | Tags: related, testing @article{Huang16, title = {In vivo thickness dynamics measurement of tear film lipid and aqueous layers with optical coherence tomography and maximum-likelihood estimation}, author = {Huang, J. and H. B. Hindman and J. P. Rolland}, year = {2016}, date = {2016-04-15}, journal = {Optics Letters}, volume = {41}, number = {9}, pages = {1981-1984 }, keywords = {related, testing}, pubstate = {published}, tppubtype = {article} } |
| Moore, D B; Fienup, J R Subaperture translation estimation accuracy in transverse-translation diversity phase retrieval Journal Article Applied Optics, 55 (10), pp. 2526-2536, 2016. Abstract | Links | BibTeX | Tags: related, testing @article{ao-55-10-2526.bib, title = {Subaperture translation estimation accuracy in transverse-translation diversity phase retrieval}, author = {Moore, D.B. and J.R. Fienup}, url = {https://www.osapublishing.org/ao/abstract.cfm?uri=ao-55-10-2526&origin=search}, doi = {10.1364/AO.55.002526}, year = {2016}, date = {2016-03-22}, journal = {Applied Optics}, volume = {55}, number = {10}, pages = {2526-2536}, abstract = {For optical metrology by transverse translation diversity phase retrieval (or ptychography), information theoretic limits on the ability to estimate subaperture translation, essential for accurate metrology, are assessed as a function of the optical aberrations of the system being measured. Special attention is given to the case that an unknown linear phase aberration, or equivalent detector or target motion, is present that varies with each point spread function in the measured data.}, keywords = {related, testing}, pubstate = {published}, tppubtype = {article} } For optical metrology by transverse translation diversity phase retrieval (or ptychography), information theoretic limits on the ability to estimate subaperture translation, essential for accurate metrology, are assessed as a function of the optical aberrations of the system being measured. Special attention is given to the case that an unknown linear phase aberration, or equivalent detector or target motion, is present that varies with each point spread function in the measured data. |
| Mehrotra, K Nano-mechanics of Optical Structures for High Laser-Damage Threshold Application PhD Thesis University of Rochester, 2016. Abstract | BibTeX | Tags: related, testing @phdthesis{Mehrotra2016, title = {Nano-mechanics of Optical Structures for High Laser-Damage Threshold Application}, author = {Mehrotra, K.}, year = {2016}, date = {2016-01-13}, address = {Department of Mechanical Engineering}, school = {University of Rochester}, abstract = {Nano-structured optical materials such as amorphous silica diffraction gratings on multilayer dielectric (MLD) thin films are critical components and performance enhancers in high-power laser applications such as in inertial confinement fusion experiments. We use nano-indentation, electron microscopy and finite-element (2D and 3D) simulations to measure and observe the nano-mechanical material properties (elastic, plastic, and fracture) of nm-level features along with their associated defects in important optical components that include single layer and multilayer oxide films, and optical diffraction gratings. Our work reveals that elasticity, ductility and fracture at the nm-level can be studied separately, in contrast to micromechanical deformation; that SEM plays an important role in identifying relevant features; that in addition to characterization, nanoindentation may be useful as a diagnostic tool; and that numerical simulations naturally complement the experimental nano-mechanics to model the complex nmlevel response of optical nanostructures.}, type = {related}, keywords = {related, testing}, pubstate = {published}, tppubtype = {phdthesis} } Nano-structured optical materials such as amorphous silica diffraction gratings on multilayer dielectric (MLD) thin films are critical components and performance enhancers in high-power laser applications such as in inertial confinement fusion experiments. We use nano-indentation, electron microscopy and finite-element (2D and 3D) simulations to measure and observe the nano-mechanical material properties (elastic, plastic, and fracture) of nm-level features along with their associated defects in important optical components that include single layer and multilayer oxide films, and optical diffraction gratings. Our work reveals that elasticity, ductility and fracture at the nm-level can be studied separately, in contrast to micromechanical deformation; that SEM plays an important role in identifying relevant features; that in addition to characterization, nanoindentation may be useful as a diagnostic tool; and that numerical simulations naturally complement the experimental nano-mechanics to model the complex nmlevel response of optical nanostructures. |
 | Yao, J; Thompson, K; Ma, B; Rolland, J P Volumetric rendering and metrology of spherical gradient refractive index lens imaged by angular scan optical coherence tomography system Journal Article Optics Express, 24 (17), pp. 19388-19404, 2016. Abstract | Links | BibTeX | Tags: related, testing @article{YAO2016, title = {Volumetric rendering and metrology of spherical gradient refractive index lens imaged by angular scan optical coherence tomography system}, author = {Yao, J. and K. Thompson and B. Ma and J. P. Rolland}, url = {https://centerfreeformoptics.org/wp-content/uploads/2017/01/oe-24-17-19388-1.pdf, Full paper}, doi = {10.1364/OE.24.019388 }, year = {2016}, date = {2016-00-00}, journal = {Optics Express}, volume = {24}, number = {17}, pages = {19388-19404}, abstract = {In this paper, we develop the methodology, including the refraction correction, geometrical thickness correction, coordinate transformation, and layer segmentation algorithms, for 3D rendering and metrology of a layered spherical gradient refractive index (S-GRIN) lens based on the imaging data collected by an angular scan optical coherence tomography (OCT) system. The 3D mapping and rendering enables direct 3D visualization and internal defect inspection of the lens. The metrology provides assessment of the surface geometry, the lens thickness, the radii of curvature of the internal layer interfaces, and the misalignment of the internal S-GRIN distribution with respect to the lens surface. The OCT metrology results identify the manufacturing defects, and enable targeted process development for optimizing the manufacturing parameters. The newly fabricated S-GRIN lenses show up to a 7x spherical aberration reduction that allows a significantly increased utilizable effective aperture. © 2016 Optical Society of America OCIS codes: (120.0120) Instrumentation, measurement, and metrology; (110.4500) Optical coherence tomography; (120.4630) Optical inspection; (110.0110) Imaging systems. }, keywords = {related, testing}, pubstate = {published}, tppubtype = {article} } In this paper, we develop the methodology, including the refraction correction, geometrical thickness correction, coordinate transformation, and layer segmentation algorithms, for 3D rendering and metrology of a layered spherical gradient refractive index (S-GRIN) lens based on the imaging data collected by an angular scan optical coherence tomography (OCT) system. The 3D mapping and rendering enables direct 3D visualization and internal defect inspection of the lens. The metrology provides assessment of the surface geometry, the lens thickness, the radii of curvature of the internal layer interfaces, and the misalignment of the internal S-GRIN distribution with respect to the lens surface. The OCT metrology results identify the manufacturing defects, and enable targeted process development for optimizing the manufacturing parameters. The newly fabricated S-GRIN lenses show up to a 7x spherical aberration reduction that allows a significantly increased utilizable effective aperture. © 2016 Optical Society of America OCIS codes: (120.0120) Instrumentation, measurement, and metrology; (110.4500) Optical coherence tomography; (120.4630) Optical inspection; (110.0110) Imaging systems. |
| Papa, J; Rolland, J P; Howard, J Starting Points for Designing Freeform Four-Mirror Telescopes Conference 2016. BibTeX | Tags: design, related @conference{Papa2016a, title = {Starting Points for Designing Freeform Four-Mirror Telescopes}, author = {Papa, J. and J.P. Rolland and J. Howard }, year = {2016}, date = {2016-00-00}, keywords = {design, related}, pubstate = {published}, tppubtype = {conference} } |
2015 |
|
 | Huang, J; Yao, J; Cirucci, N; Ivanov, T; Rolland, J P Performance analysis of optical coherence tomography in the context of a thickness estimation task Journal Article Journal of Biomedical Optics, 20 (12), pp. 121306, 2015. BibTeX | Tags: related, testing @article{Huang15, title = {Performance analysis of optical coherence tomography in the context of a thickness estimation task}, author = {Huang, J. and J. Yao and N. Cirucci and T. Ivanov and J. P. Rolland}, year = {2015}, date = {2015-12-01}, journal = {Journal of Biomedical Optics}, volume = {20}, number = {12}, pages = {121306}, keywords = {related, testing}, pubstate = {published}, tppubtype = {article} } |
 | Kitt, A; Rolland, J P; Vamivakas, A N Visible metasurfaces and ruled diffraction gratings: a comparison Journal Article Opt. Express, 5 (12), pp. 2895-2901, 2015. BibTeX | Tags: design, related @article{Kitt15, title = {Visible metasurfaces and ruled diffraction gratings: a comparison}, author = {Kitt, A. and J. P. Rolland and A. N. Vamivakas}, year = {2015}, date = {2015-11-23}, journal = {Opt. Express}, volume = {5}, number = {12}, pages = {2895-2901}, keywords = {design, related}, pubstate = {published}, tppubtype = {article} } |
| Giannechini, L Design and Quantification of Highly Corrosion-Resistant Magnetorheological Finishing Powder Masters Thesis University of Rochester, 2015. Abstract | BibTeX | Tags: manufacturing, related @mastersthesis{Giannechini2015, title = {Design and Quantification of Highly Corrosion-Resistant Magnetorheological Finishing Powder}, author = {Giannechini, L.}, year = {2015}, date = {2015-11-10}, address = {Department of Mechanical Engineering}, school = {University of Rochester}, abstract = {The purpose of this work is to increase the corrosion resistance of micron-sized zirconia coated iron powders, and to develop a reliable and precise method of quantifying a variety of the material's parameters. The powders that were tested are used as the base of the magnetorheological nishing slurries in the Magnetorehological Finishing (MRF) lab at the Laboratory for Laser Energetics. Development of the following methods enables quantitative comparisons between various batches of MRF powder, and serves as a metric for variations in performance. In this work, methods for the quanti cation of: corrosion time, mass fraction of the elements in the bulk powder, powder density, particle size distribution, concentration of free zirconia, and coating thickness were developed. This research was performed as a result of recent MRF work combining the e ects of acid etching and mechanical removal of material into a single process, which made it necessary to both increase the corrosion resistance of the material, as well as to de ning di erences between the two iterations of the product. Several techniques were used to obtain the data necessary for analysis of the powders. A full factorial experiment was employed to determine what factors to alter in the powder production. Techniques including XRD, XPS, EDS, and XRF were all utilized in determining the relative mass fraction of the components present in the powder. Gas pycnometry and colloidal analysis were used to determine densities and particle size distributions. Magnetic separation and centrifugation were used to isolate and condense the nonmagnetic free zirconia present in the samples. Scanning electron microscopy (SEM) micrographs of particle cross sections enabled analysis of coating thicknesses. Increasing the concentration of zirconia during the coating procedure resulted in a positive correlation with improved corrosion resistance. Of the methods used to analyze mass fraction, XRF proved to be the fastest and most reliable. If further improvements in corrosion resistance are required, it is recommended to increase the thickness of the zirconia coating, or develop a dual coating of an acid resistant polymer and zirconia (although this may have adverse e ects on the powder's magnetic potential).}, type = {related}, keywords = {manufacturing, related}, pubstate = {published}, tppubtype = {mastersthesis} } The purpose of this work is to increase the corrosion resistance of micron-sized zirconia coated iron powders, and to develop a reliable and precise method of quantifying a variety of the material's parameters. The powders that were tested are used as the base of the magnetorheological nishing slurries in the Magnetorehological Finishing (MRF) lab at the Laboratory for Laser Energetics. Development of the following methods enables quantitative comparisons between various batches of MRF powder, and serves as a metric for variations in performance. In this work, methods for the quanti cation of: corrosion time, mass fraction of the elements in the bulk powder, powder density, particle size distribution, concentration of free zirconia, and coating thickness were developed. This research was performed as a result of recent MRF work combining the e ects of acid etching and mechanical removal of material into a single process, which made it necessary to both increase the corrosion resistance of the material, as well as to de ning di erences between the two iterations of the product. Several techniques were used to obtain the data necessary for analysis of the powders. A full factorial experiment was employed to determine what factors to alter in the powder production. Techniques including XRD, XPS, EDS, and XRF were all utilized in determining the relative mass fraction of the components present in the powder. Gas pycnometry and colloidal analysis were used to determine densities and particle size distributions. Magnetic separation and centrifugation were used to isolate and condense the nonmagnetic free zirconia present in the samples. Scanning electron microscopy (SEM) micrographs of particle cross sections enabled analysis of coating thicknesses. Increasing the concentration of zirconia during the coating procedure resulted in a positive correlation with improved corrosion resistance. Of the methods used to analyze mass fraction, XRF proved to be the fastest and most reliable. If further improvements in corrosion resistance are required, it is recommended to increase the thickness of the zirconia coating, or develop a dual coating of an acid resistant polymer and zirconia (although this may have adverse e ects on the powder's magnetic potential). |
 | Yao, J; Huang, J; Meemon, P; Ponting, M; Rolland, J P Simultaneous estimation of thickness and refractive index of layered gradient refractive index optics using a hybrid confocal-scan swept-source optical coherence tomography system Journal Article Opt. Express, 23 (23), pp. 30149-30164, 2015. BibTeX | Tags: related, testing @article{YAO15b, title = {Simultaneous estimation of thickness and refractive index of layered gradient refractive index optics using a hybrid confocal-scan swept-source optical coherence tomography system}, author = {Yao, J. and J. Huang and P. Meemon and M. Ponting and J. P. Rolland}, year = {2015}, date = {2015-11-10}, journal = {Opt. Express}, volume = {23}, number = {23}, pages = {30149-30164}, keywords = {related, testing}, pubstate = {published}, tppubtype = {article} } |
 | Gray, R Investigation of the Field Dependence of the Aberration Functions of Rotationally Nonsymmetric Optical Imaging Systems PhD Thesis 2015. BibTeX | Tags: design, related @phdthesis{GRAY-THESIS, title = {Investigation of the Field Dependence of the Aberration Functions of Rotationally Nonsymmetric Optical Imaging Systems}, author = {Gray, R.}, year = {2015}, date = {2015-11-06}, keywords = {design, related}, pubstate = {published}, tppubtype = {phdthesis} } |
| Salzman, S; Romanofsky, H J; Giannechini, L J; Jacobs, S D; Lambropoulos, J C Magnetorheological finishing of chemical-vapor-deposited zinc sulfide via chemically and mechanically modified fluids Journal Article Applied Optics, 55 (6), pp. 1481, 2015. Abstract | BibTeX | Tags: manufacturing, related @article{Salzman15, title = {Magnetorheological finishing of chemical-vapor-deposited zinc sulfide via chemically and mechanically modified fluids}, author = {Salzman, S. and H. J. Romanofsky and L. J. Giannechini and S. D. Jacobs and J. C. Lambropoulos}, year = {2015}, date = {2015-11-03}, journal = {Applied Optics}, volume = {55}, number = {6}, pages = {1481}, abstract = {We describe the anisotropy in the material-removal rate (MRR) of the polycrystalline, chemical-vapor–deposited (CVD) zinc sulfide (ZnS). We define the polycrystalline anisotropy via microhardness and chemical erosion tests for four crystallographic orientations of ZnS: (100), (110), (111), and (311). Anisotropy in the MRR was studied under magnetorheological finishing (MRF) conditions. Three chemically and mechanically modified magnetorheological (MR) fluids at pH values of 4, 5, and 6 were used to test the MRR variations among the four single-crystal planes. When polishing the single-crystal planes and the polycrystalline with pH 5 and pH 6 MR fluids, variations were found in the MRR among the four single-crystal planes and surface artifacts were observed on the polycrystalline material. When polishing the single-crystal planes and the polycrystalline with the modified MR fluid at pH 4, however, minimal variation was observed in the MRR among the four orientations and a reduction in surface artifacts was achieved on the polycrystalline material.}, keywords = {manufacturing, related}, pubstate = {published}, tppubtype = {article} } We describe the anisotropy in the material-removal rate (MRR) of the polycrystalline, chemical-vapor–deposited (CVD) zinc sulfide (ZnS). We define the polycrystalline anisotropy via microhardness and chemical erosion tests for four crystallographic orientations of ZnS: (100), (110), (111), and (311). Anisotropy in the MRR was studied under magnetorheological finishing (MRF) conditions. Three chemically and mechanically modified magnetorheological (MR) fluids at pH values of 4, 5, and 6 were used to test the MRR variations among the four single-crystal planes. When polishing the single-crystal planes and the polycrystalline with pH 5 and pH 6 MR fluids, variations were found in the MRR among the four single-crystal planes and surface artifacts were observed on the polycrystalline material. When polishing the single-crystal planes and the polycrystalline with the modified MR fluid at pH 4, however, minimal variation was observed in the MRR among the four orientations and a reduction in surface artifacts was achieved on the polycrystalline material. |
CeFO-Related Publications
2020 |
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| Grinding of additively manufactured silicon carbide surfaces for optical applications Journal Article CIRP Annals, 69 , pp. 509-512, 2020. |
| Single-Shot Phase Calibration of a Spatial Light Modulator using Geometric Phase Interferometry Journal Article Appl. Opt., 2020. |
2019 |
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High-performance optical differentiation wavefront sensing towards freeform metrology Journal Article Opt. Express, 27 (25), pp. 36297-36310, 2019. | |
| Absolute linear-in-k spectrometer designs enabled by freeform optics Journal Article Optics Express, 27 (24), pp. 34593-34602, 2019. |
Effects on the OTF of MSF structures with random variations Journal Article Optics Express, 27 (24), pp. 34665-34680, 2019. | |
| All-reflective electronic viewfinder enable by freeform optics Journal Article Optics Express, 27 (21), pp. 30597-30605, 2019. |
| Femtosecond laser polishing of germanium Journal Article Optical Materials Express, 9 (11), pp. 4165-4177, 2019. |
Pulse-Propagation Modeling and Experiment for Femtosecond-Laser Writing of Waveguide in Nd:YAG Journal Article Crystals , 9 (8), pp. 434, 2019. | |
Study of reflectors for illumination via conformal maps Journal Article Optics Letters, 44 (15), pp. 3809-3812, 2019. | |
| All-Reflective Freeform Viewfinder Conference OSA Technical Digest, (FM2B.4), OSA, 2019. |
Development of a Convex Surface Measurement Using Prescription Retrieval Conference OSA Technical Digest, (JW2A.7), OSA, 2019, ISBN: 978-1-943580-60-6. | |
| Calibration of an SLM using Geometric Phase Interferometry Journal Article RIAO-OPTILAS-MOPM, 2019. |
High-efficiency femtosecond ablation of silicon with GHz repetition rate laser source Journal Article Opt. Lett., 44 (9), pp. 2193-2196, 2019. | |
| Shearing interferometry via geometric phase Journal Article Optica, 6 (4), pp. 396-399, 2019. |
2018 |
|
| A novel pump-probe microscope for measuring the dynamics of plasma and surface structuring by femtosecond lasers Conference ICALEO 37th International Congress on Applications of Lasers & Electro-Optics, Paper LMF 5, 2018. |
Gaussian curvature and stigmatic imaging relations for the design of an unobscured reflective relay Journal Article Optics Letters, (20), pp. 4855-4858, 2018. | |
| Differentiating non-thermal ablation and heat accumulation toward ablation-cooled ultrafast-laser processing Conference The 19th International Symposium on Laser Precision Microfabrication, Edinburgh, UK, 2018. |
Starting point designs for freeform four-mirror systems Journal Article Optical Engineering, 57 (10), pp. 101705, 2018. | |
| Three-mirror freeform imagers Proceeding SPIE Optical Systems Design VII, 10690 , 2018. |
| Engineering the ultimate augmented reality display: Paths towards a digital window into the world Miscellaneous 2018. |
| Direct binary search for improved beam shaping and optical differentiation wavefront sensing Journal Article Applied Optics, 57 (29) , pp. 8557-8565 , 2018. |
| Point-cloud noncontact metrology of freeform optical surfaces Journal Article Optics Express, 26 (8), pp. 10242-10265, 2018. |
| Experimental investigation in nodal aberration theory (NAT) with a customized Ritchey-Chrétien system: third-order coma Journal Article Optics Express, 26 (7), pp. 8729-8743, 2018. |
| Predicting Ablation-Cooled Gigahertz Ultrafast Laser Processing via Integrated Modeling Conference ICALEO 37th International Congress on Applications of Lasers & Electro-Optics, Paper LMF 6, 2018. |
| Integrating two-temperature and classical heat accumulation models to predict femtosecond laser processing of silicon Journal Article Optical Materials Express, 8 (3), pp. 648-658, 2018. |
2017 |
|
| Four-Mirror Freeform Design Conference Mirror Tech/SBIR/STTR Workshop 2017, 2017. |
| Twyman effects in thin curved optics Proceeding SPIE, SPIE Vol 10448 (104480V (2017)), 2017. |
| Starting Point Designs for Freeform Four-Mirror Systems Conference Proceedings of the International Optical Design Conference 2017, Optical Society of America, 2017, ISBN: 978-1-943580-31-6. |
| Simplified Tolerancing of Alignment Errors in Dynamic Freeform Optical Systems Conference Freeform 2017 (Freeform, IODC, OFT), Optical Society of America, 2017. |
| Design of a Variable Toric Lens Using Laterally Shifted Freeform Elements Conference Freeform 2017 (Freeform, IODC, OFT), Optical Society of America, 2017. |
| MTF as the Fourier Transform of a Pupil-Difference Probability Density Presentation 09.07.2017, (Freeform Optics 2017 Denver, Colorado United States 9–13 July 2017). |
| Measuring wavefront by optical differentiation with binary pixelated filters Proceeding Optical Society of America, Imaging and Applied Optics, 2017. |
| Conference on Lasers and Electro-Optics (CLEO), Optical Society of America, 2017. |
| Birefringent masks that are optimal for generating bottle fields Journal Article Optics Express, 25 (8), pp. 9318-9332, 2017. |
| Optomechanical tolerancing of dynamic freeform optical systems Conference Proceedings ASPE/ASPEN Spring Topical Meeting: Manufacture and Metrology of Structured and Freeform Surfaces for Functional Applications, ASPE/ASPEN, 2017, (Proceedings of ASPE/ASPEN Spring Topical Meeting). |
2016 |
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| Optical Society of America, 2016, ISBN: 978-1-943580-19-4, (The CEFO project relevant portions were not included in the proceeding but were presented directly at the conference. Presentation slides are available upon request. ). |
| Ptychography for optical metrology with limited translation knowledge Journal Article Applied Optics, 55 (17), pp. 4596-4610, 2016. |
| An Evaluation of Fiber-Based Tools for Glass Polishing Using Experimental and Computational Approaches Journal Article Applied Optics, 45 (16), pp. 4307-4316, 2016. |
| Optimal magnetorheological fluid for finishing of CVD zinc sulfide PhD Thesis University of Rochester, 2016. |
| In vivo thickness dynamics measurement of tear film lipid and aqueous layers with optical coherence tomography and maximum-likelihood estimation Journal Article Optics Letters, 41 (9), pp. 1981-1984 , 2016. |
| Subaperture translation estimation accuracy in transverse-translation diversity phase retrieval Journal Article Applied Optics, 55 (10), pp. 2526-2536, 2016. |
| Nano-mechanics of Optical Structures for High Laser-Damage Threshold Application PhD Thesis University of Rochester, 2016. |
| Volumetric rendering and metrology of spherical gradient refractive index lens imaged by angular scan optical coherence tomography system Journal Article Optics Express, 24 (17), pp. 19388-19404, 2016. |
| Starting Points for Designing Freeform Four-Mirror Telescopes Conference 2016. |
2015 |
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| Performance analysis of optical coherence tomography in the context of a thickness estimation task Journal Article Journal of Biomedical Optics, 20 (12), pp. 121306, 2015. |
| Visible metasurfaces and ruled diffraction gratings: a comparison Journal Article Opt. Express, 5 (12), pp. 2895-2901, 2015. |
| Design and Quantification of Highly Corrosion-Resistant Magnetorheological Finishing Powder Masters Thesis University of Rochester, 2015. |
| Simultaneous estimation of thickness and refractive index of layered gradient refractive index optics using a hybrid confocal-scan swept-source optical coherence tomography system Journal Article Opt. Express, 23 (23), pp. 30149-30164, 2015. |
| Investigation of the Field Dependence of the Aberration Functions of Rotationally Nonsymmetric Optical Imaging Systems PhD Thesis 2015. |
| Magnetorheological finishing of chemical-vapor-deposited zinc sulfide via chemically and mechanically modified fluids Journal Article Applied Optics, 55 (6), pp. 1481, 2015. |