CeFO Publications

@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}
}

@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}
}

@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}
}

@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}
}

@article{Michalko2018b,
title = {Transverse translation diverse phase retrieval using soft-edged illumination},
author = {A. M. Michalko and J. R. Fienup},
editor = {Optical Society of America},
url = {https://doi.org/10.1364/OL.43.001331},
doi = {10.1364/OL.43.001331},
year = {2018},
date = {2018-03-14},
journal = {Optics Letters},
volume = {43},
number = {6},
pages = {1331-1334},
abstract = {Transverse translation diverse phase retrieval (TTDPR), a ptychographic image-based wavefront-sensing technique, is a viable method for optical shop testing due to its high accuracy and relatively simple experimental arrangement. However, when measuring a reflective optic, a normally hard-edged translating illumination will become soft-edged due to diffraction, which may reduce the accuracy of TTDPR by suppressing fine structures in measured data. In this Letter, we quantitatively explore the wavefront-sensing accuracy of TTDPR in the presence of soft-edged translating illumination.},
keywords = {CeFO, CEFO metrology, metrology},
pubstate = {published},
tppubtype = {article}
}

@article{Xu2017,
title = {Design, fabrication, and testing of convex reflective diffraction gratings },
author = {D. Xu and J. Owen and J. Papa and J. P. Reimers and T. J. Suleski and J. R. Troutman and M. A. Davies and K. P. Thompson and J. P. Rolland},
url = {https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-13-15252},
year = {2017},
date = {2017-06-26},
journal = {Optics Express},
volume = {25},
number = {13},
pages = {15252-15268},
abstract = {The convex reflective diffraction grating is an essential optical component that lends itself to various applications. In this work, we first outline the design principles of convex diffraction gratings from wavefront quality and efficiency perspectives. We then describe a unique fabrication method that allows for the machining of convex diffraction gratings with variable groove structure, which is extendable to rotationally non-symmetric convex diffraction grating substrates. Finally, we demonstrate two quantitative wavefront measurement methods and respective experimental validation.},
keywords = {CeFO, fabrication, metrology},
pubstate = {published},
tppubtype = {article}
}