2019 |
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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. @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 = {}, 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. | |
 | 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. @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 = {}, 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. |
 | Nick Takaki Aaron Bauer, ; Rolland, Jannick P On-the-fly surface manufacturability constraints for freeform optical design enabled by orthogonal polynomials Journal Article Optics Express, 27 (5), pp. 6129-6146, 2019. @article{Takaki_manufacturability, title = {On-the-fly surface manufacturability constraints for freeform optical design enabled by orthogonal polynomials}, author = {Nick Takaki, Aaron Bauer, and Jannick P. Rolland}, editor = {James Leger, Ulrike Fuchs }, url = {https://doi.org/10.1364/OE.27.006129}, doi = {10.1364/OE.27.006129}, year = {2019}, date = {2019-02-20}, journal = {Optics Express}, volume = {27}, number = {5}, pages = {6129-6146}, abstract = {When leveraging orthogonal polynomials for describing freeform optics, designers typically focus on the computational efficiency of convergence and the optical performance of the resulting designs. However, to physically realize these designs, the freeform surfaces need to be fabricated and tested. An optimization constraint is described that allows on-the-fly calculation and constraint of manufacturability estimates for freeform surfaces, namely peak-to-valley sag departure and maximum gradient normal departure. This constraint’s construction is demonstrated in general for orthogonal polynomials, and in particular for both Zernike polynomials and Forbes 2D-Q polynomials. Lastly, this optimization constraint’s impact during design is shown via two design studies: a redesign of a published unobscured three-mirror telescope in the ball geometry for use in LWIR imaging and a freeform prism combiner for use in AR/VR applications. It is shown that using the optimization penalty with a fixed number of coefficients enables an improvement in manufacturability in exchange for a tradeoff in optical performance. It is further shown that, when the number of coefficients is increased in conjunction with the optimization penalty, manufacturability estimates can be improved without sacrificing optical performance.}, keywords = {}, pubstate = {published}, tppubtype = {article} } When leveraging orthogonal polynomials for describing freeform optics, designers typically focus on the computational efficiency of convergence and the optical performance of the resulting designs. However, to physically realize these designs, the freeform surfaces need to be fabricated and tested. An optimization constraint is described that allows on-the-fly calculation and constraint of manufacturability estimates for freeform surfaces, namely peak-to-valley sag departure and maximum gradient normal departure. This constraint’s construction is demonstrated in general for orthogonal polynomials, and in particular for both Zernike polynomials and Forbes 2D-Q polynomials. Lastly, this optimization constraint’s impact during design is shown via two design studies: a redesign of a published unobscured three-mirror telescope in the ball geometry for use in LWIR imaging and a freeform prism combiner for use in AR/VR applications. It is shown that using the optimization penalty with a fixed number of coefficients enables an improvement in manufacturability in exchange for a tradeoff in optical performance. It is further shown that, when the number of coefficients is increased in conjunction with the optimization penalty, manufacturability estimates can be improved without sacrificing optical performance. |
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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, pubstate = {published}, tppubtype = {proceedings} } |
 | Rolland, J P Engineering the ultimate augmented reality display: Paths towards a digital window into the world Miscellaneous 2018. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, pubstate = {published}, tppubtype = {conference} } |
 | Lambropoulos, John C Twyman effects in thin curved optics Proceeding SPIE, SPIE Vol 10448 (104480V (2017)), 2017. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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). @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 = {}, 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. @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 = {}, pubstate = {published}, tppubtype = {proceedings} } |
 | Scott, R E; Taylor, L L; Qiao, J Conference on Lasers and Electro-Optics (CLEO), Optical Society of America, 2017. @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 = {}, 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. @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 = {}, 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). @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 = {}, 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. ). @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, 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. @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 = {}, pubstate = {published}, tppubtype = {conference} } |
2015 |
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 | 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. @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 = {}, 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. @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 = {}, pubstate = {published}, tppubtype = {article} } |
| Giannechini, L Design and Quantification of Highly Corrosion-Resistant Magnetorheological Finishing Powder Masters Thesis University of Rochester, 2015. @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 = {}, 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. @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 = {}, pubstate = {published}, tppubtype = {article} } |
 | Gray, R Investigation of the Field Dependence of the Aberration Functions of Rotationally Nonsymmetric Optical Imaging Systems PhD Thesis 2015. @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 = {}, 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. @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 = {}, 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. |
 | Moore, D B; Fienup, J R Sub-Aperture Position Estimation in Transverse-Translation Diversity Wavefront Sensing Conference 2015. @conference{Moore_AOMS_2015, title = {Sub-Aperture Position Estimation in Transverse-Translation Diversity Wavefront Sensing}, author = {D. B. Moore and J.R. Fienup}, doi = {10.1364/AOMS.2015.AOM3F.4}, year = {2015}, date = {2015-10-21}, journal = {Imaging and Applied Optics 2015 OSA Technical Digest (online) (Optical Society of America, 2015)}, pages = {AOM3F.4}, abstract = {Image-based wavefront sensing involving a sub-aperture translating in an unknown fashion in a pupil plane is demonstrated experimentally in the case that the target is also translating in an unknown fashion.}, keywords = {}, pubstate = {published}, tppubtype = {conference} } Image-based wavefront sensing involving a sub-aperture translating in an unknown fashion in a pupil plane is demonstrated experimentally in the case that the target is also translating in an unknown fashion. |
 | Yao, Jianing; Xu, Di; Zhao, Nan; Rolland, Jannick P Freeform metrology using swept-source optical coherence tomography with custom pupil-relay precision scanning configuration Conference Proceedings of SPIE, 9633 (96331A), 2015. @conference{Yao15optifab, title = {Freeform metrology using swept-source optical coherence tomography with custom pupil-relay precision scanning configuration}, author = {Jianing Yao and Di Xu and Nan Zhao and Jannick P. Rolland}, year = {2015}, date = {2015-10-11}, booktitle = {Proceedings of SPIE}, volume = {9633}, number = {96331A}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
 | Huang, J; Yao, J; Cirucci, N M; Ivanov, T; Rolland, J P Thickness estimation with optical coherence tomography and statistical decision theory Conference proceeding of SPIE, 9633 (96330P), 2015. @conference{Huangoptifab15, title = {Thickness estimation with optical coherence tomography and statistical decision theory}, author = {Huang, J. and J. Yao and N.M. Cirucci and T. Ivanov and J.P. Rolland}, year = {2015}, date = {2015-10-11}, booktitle = {proceeding of SPIE}, volume = {9633}, number = {96330P}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
 | Canavesi, C; Cogliati, A; Hayes, A; Santhanam, A P; Tankam, P; Rolland, J P Gabor-domain optical coherence microscopy with integrated dual-axis MEMS scanner for fast 3D imaging and metrology Conference Proceedings of the SPIE, 9633 (96330O), 2015. @conference{Canavesioptifab15, title = {Gabor-domain optical coherence microscopy with integrated dual-axis MEMS scanner for fast 3D imaging and metrology}, author = {Canavesi, C. and A. Cogliati and A. Hayes and A.P. Santhanam and P. Tankam and J.P. Rolland}, year = {2015}, date = {2015-10-11}, booktitle = {Proceedings of the SPIE}, volume = {9633}, number = {96330O}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
| Gray, R; Rolland, J P Wavefront aberration function in terms of R.V. Shack’s vector product and Zernike polynomial vectors Journal Article JOSA A, 32 (10), pp. 1836-1847, 2015. @article{GRAY15, title = {Wavefront aberration function in terms of R.V. Shack’s vector product and Zernike polynomial vectors}, author = {Gray, R. and J. P. Rolland}, year = {2015}, date = {2015-08-18}, journal = {JOSA A}, volume = {32}, number = {10}, pages = {1836-1847}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
 | Duma, V; Tankam, P; Huang, J; Won, J; J. P. Rolland, Optimization of galvanometer scanning for optical coherence tomography Journal Article Applied Optics, 54 (17), pp. 5495-5507, 2015. @article{DUMA15, title = {Optimization of galvanometer scanning for optical coherence tomography}, author = {Duma, V. and P. Tankam and J. Huang and J. Won and J. P. Rolland,}, year = {2015}, date = {2015-06-10}, journal = {Applied Optics}, volume = {54}, number = {17}, pages = {5495-5507}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
 | Yao, J; Meemon, P; Ponting, M; Rolland, J P Metrology of 3D freeform spherical gradient index preforms Conference Imaging and Applied Optics 2015OSA Technical Digest, (FT3B.3 ), 2015, (Imaging and Applied Optics 2015, OSA Technical Digest, paper FT3B.3 (2015). ). @conference{Yao15pa, title = {Metrology of 3D freeform spherical gradient index preforms}, author = {Yao, J. and P. Meemon and M. Ponting and J. P. Rolland}, year = {2015}, date = {2015-06-08}, booktitle = {Imaging and Applied Optics 2015OSA Technical Digest}, number = {FT3B.3 }, note = {Imaging and Applied Optics 2015, OSA Technical Digest, paper FT3B.3 (2015). }, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
| Evans, C J; Browy, E C; Childs, T H C; Paul, E Interferometric measurements of single crystal diamond tool wear Journal Article CIRP Annals - Manufacturing Technology, 64 , pp. 125-128, 2015. @article{Evans15, title = {Interferometric measurements of single crystal diamond tool wear}, author = {Evans, C. J. and E.C. Browy and T.H.C. Childs and E. Paul }, year = {2015}, date = {2015-05-04}, journal = {CIRP Annals - Manufacturing Technology}, volume = {64}, pages = {125-128}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
 | Huang, J; Tankam, P; Hindman, H B; Aquavella, J V; Clarkson, E; Kupinski, M A; Rolland, J P Tear film thickness estimation using optical coherence tomography and maximum-likelihood estimation Presentation 02.05.2015. @misc{Huangarvo, title = {Tear film thickness estimation using optical coherence tomography and maximum-likelihood estimation}, author = {Huang, J. and P. Tankam and H. B. Hindman and J. V. Aquavella and E. Clarkson and M. A. Kupinski and J. P. Rolland}, year = {2015}, date = {2015-05-02}, keywords = {}, pubstate = {published}, tppubtype = {presentation} } |
| Leach, R; Evans, C; He, L; Davies, A; Duparre, A; Henning, A; Jones, C; O'Connor, D Open Questions in Surface Topography Measurement: a roadmap Journal Article Surface Topography: Metrology and Properties, 3 (1), pp. 013001, 2015. @article{Leach15, title = {Open Questions in Surface Topography Measurement: a roadmap}, author = {Leach, R. and C. Evans and L. He and A. Davies and A. Duparre and A. Henning and C. Jones and D. O'Connor}, year = {2015}, date = {2015-03-31}, journal = {Surface Topography: Metrology and Properties}, volume = {3}, number = {1}, pages = {013001}, abstract = {Control of surface topography has always been of vital importance for manufacturing and many other engineering and scientific disciplines. However, despite over one hundred years of quantitative surface topography measurement, there are still many open questions. At the top of the list of questions is 'Are we getting the right answer?' This begs the obvious question 'How would we know?' There are many other questions relating to applications, the appropriateness of a technique for a given scenario, or the relationship between a particular analysis and the function of the surface. In this first 'open questions' article we have gathered together some experts in surface topography measurement and asked them to address timely, unresolved questions about the subject. We hope that their responses will go some way to answer these questions, address areas where further research is required, and look at the future of the subject. The first section 'Spatial content characterization for precision surfaces' addresses the need to characterise the spatial content of precision surfaces. Whilst we have been manufacturing optics for centuries, there still isn't a consensus on how to specify the surface for manufacture. The most common three methods for spatial characterisation are reviewed and compared, and the need for further work on quantifying measurement uncertainties is highlighted. The article is focussed on optical surfaces, but the ideas are more pervasive. Different communities refer to 'figure, mid-spatial frequencies, and finish' and 'form, waviness, and roughness', but the mathematics are identical. The second section 'Light scattering methods' is focussed on light scattering techniques; an important topic with in-line metrology becoming essential in many manufacturing scenarios. The potential of scattering methods has long been recognized; in the 'smooth surface limit' functionally significant relationships can be derived from first principles for statistically stationary, random surfaces. For rougher surfaces, correlations can be found experimentally for specific manufacturing processes. Improvements in computational methods encourage us to revisit light scattering as a powerful and versatile tool to investigate surface and thin film topographies, potentially providing information on both topography and defects over large areas at high speed. Future scattering techniques will be applied for complex film systems and for sub-surface damage measurement, but more research is required to quantify and standardise such measurements. A fundamental limitation of all topography measurement systems is their finite spatial bandwidth, which limits the slopes that they can detect. The third section 'Optical measurements of surfaces containing high slope angles' discusses this limitation and potential methods to overcome it. In some cases, a rough surface can allow measurement of slopes outside the classical optics limit, but more research is needed to fully understand this process. The last section 'What are the challenges for high dynamic range surface measurement?' presents the challenge facing metrologists by the use of surfaces that need measurement systems with very high spatial and temporal bandwidths, for example, those found in roll-to-roll manufacturing. High resolution, large areas and fast measurement times are needed, and these needs are unlikely to be fulfilled by developing a single all-purpose instrument. A toolbox of techniques needs to be developed which can be applied for any specific manufacturing scenario. The functional significance of surface topography has been known for centuries. Mirrors are smooth. Sliding behaviour depends on roughness. We have been measuring surfaces for centuries, but we still face many challenges. New manufacturing paradigms suggest that we need to make rapid measurements online that relate to the functional performance of the surface. This first 'open questions' collection addresses a subset of the challenges facing the surface metrology community. There are many more challenges which we would like to address in future 'open questions' articles. We welcome your feedback and your suggestions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Control of surface topography has always been of vital importance for manufacturing and many other engineering and scientific disciplines. However, despite over one hundred years of quantitative surface topography measurement, there are still many open questions. At the top of the list of questions is 'Are we getting the right answer?' This begs the obvious question 'How would we know?' There are many other questions relating to applications, the appropriateness of a technique for a given scenario, or the relationship between a particular analysis and the function of the surface. In this first 'open questions' article we have gathered together some experts in surface topography measurement and asked them to address timely, unresolved questions about the subject. We hope that their responses will go some way to answer these questions, address areas where further research is required, and look at the future of the subject. The first section 'Spatial content characterization for precision surfaces' addresses the need to characterise the spatial content of precision surfaces. Whilst we have been manufacturing optics for centuries, there still isn't a consensus on how to specify the surface for manufacture. The most common three methods for spatial characterisation are reviewed and compared, and the need for further work on quantifying measurement uncertainties is highlighted. The article is focussed on optical surfaces, but the ideas are more pervasive. Different communities refer to 'figure, mid-spatial frequencies, and finish' and 'form, waviness, and roughness', but the mathematics are identical. The second section 'Light scattering methods' is focussed on light scattering techniques; an important topic with in-line metrology becoming essential in many manufacturing scenarios. The potential of scattering methods has long been recognized; in the 'smooth surface limit' functionally significant relationships can be derived from first principles for statistically stationary, random surfaces. For rougher surfaces, correlations can be found experimentally for specific manufacturing processes. Improvements in computational methods encourage us to revisit light scattering as a powerful and versatile tool to investigate surface and thin film topographies, potentially providing information on both topography and defects over large areas at high speed. Future scattering techniques will be applied for complex film systems and for sub-surface damage measurement, but more research is required to quantify and standardise such measurements. A fundamental limitation of all topography measurement systems is their finite spatial bandwidth, which limits the slopes that they can detect. The third section 'Optical measurements of surfaces containing high slope angles' discusses this limitation and potential methods to overcome it. In some cases, a rough surface can allow measurement of slopes outside the classical optics limit, but more research is needed to fully understand this process. The last section 'What are the challenges for high dynamic range surface measurement?' presents the challenge facing metrologists by the use of surfaces that need measurement systems with very high spatial and temporal bandwidths, for example, those found in roll-to-roll manufacturing. High resolution, large areas and fast measurement times are needed, and these needs are unlikely to be fulfilled by developing a single all-purpose instrument. A toolbox of techniques needs to be developed which can be applied for any specific manufacturing scenario. The functional significance of surface topography has been known for centuries. Mirrors are smooth. Sliding behaviour depends on roughness. We have been measuring surfaces for centuries, but we still face many challenges. New manufacturing paradigms suggest that we need to make rapid measurements online that relate to the functional performance of the surface. This first 'open questions' collection addresses a subset of the challenges facing the surface metrology community. There are many more challenges which we would like to address in future 'open questions' articles. We welcome your feedback and your suggestions. |
 | Yao, J; Meemon, P; Ponting, M; Rolland, J P Angular scan optical coherence tomography imaging and metrology of spherical gradient refractive index preforms Journal Article Opt. Express, 23 (5), pp. 6428-6443, 2015. @article{YAO15a, title = {Angular scan optical coherence tomography imaging and metrology of spherical gradient refractive index preforms}, author = {Yao, J. and P. Meemon and M. Ponting and J. P. Rolland}, year = {2015}, date = {2015-03-05}, journal = {Opt. Express}, volume = {23}, number = {5}, pages = {6428-6443}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
CeFO-Related Publications
2019 |
|
Study of reflectors for illumination via conformal maps Journal Article Optics Letters, 44 (15), pp. 3809-3812, 2019. | |
| Shearing interferometry via geometric phase Journal Article Optica, 6 (4), pp. 396-399, 2019. |
| On-the-fly surface manufacturability constraints for freeform optical design enabled by orthogonal polynomials Journal Article Optics Express, 27 (5), pp. 6129-6146, 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 |
|
| 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 |
|
| 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. |
| Sub-Aperture Position Estimation in Transverse-Translation Diversity Wavefront Sensing Conference 2015. |
| Freeform metrology using swept-source optical coherence tomography with custom pupil-relay precision scanning configuration Conference Proceedings of SPIE, 9633 (96331A), 2015. |
| Thickness estimation with optical coherence tomography and statistical decision theory Conference proceeding of SPIE, 9633 (96330P), 2015. |
| Gabor-domain optical coherence microscopy with integrated dual-axis MEMS scanner for fast 3D imaging and metrology Conference Proceedings of the SPIE, 9633 (96330O), 2015. |
| Wavefront aberration function in terms of R.V. Shack’s vector product and Zernike polynomial vectors Journal Article JOSA A, 32 (10), pp. 1836-1847, 2015. |
| Optimization of galvanometer scanning for optical coherence tomography Journal Article Applied Optics, 54 (17), pp. 5495-5507, 2015. |
| Metrology of 3D freeform spherical gradient index preforms Conference Imaging and Applied Optics 2015OSA Technical Digest, (FT3B.3 ), 2015, (Imaging and Applied Optics 2015, OSA Technical Digest, paper FT3B.3 (2015). ). |
| Interferometric measurements of single crystal diamond tool wear Journal Article CIRP Annals - Manufacturing Technology, 64 , pp. 125-128, 2015. |
| Tear film thickness estimation using optical coherence tomography and maximum-likelihood estimation Presentation 02.05.2015. |
| Open Questions in Surface Topography Measurement: a roadmap Journal Article Surface Topography: Metrology and Properties, 3 (1), pp. 013001, 2015. |
| Angular scan optical coherence tomography imaging and metrology of spherical gradient refractive index preforms Journal Article Opt. Express, 23 (5), pp. 6428-6443, 2015. |