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9 August 2010 False diamond turning artifacts in phase retrieval results
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Abstract
Many modern optical designs employ diamond-turned optical components and utilize phase retrieval for metrology during testing, assembly, and commissioning. The accuracy of the wavefronts obtained by phase retrieval depends on the fidelity of the system model used during the retrieval, including knowledge of the pupil amplitude, and the relationship between the digital sample spacing in the pupil and each point spread function (PSF), i.e., the plate scale. However, recent simulations have shown that errors in the estimation of both the plate scale and unknown pupil vignetting can both lead to mid-spatial-frequency groove-like errors in the wavefront maps obtained by phase retrieval. In particular, these errors manifest themselves as concentric rings resembling diamond-turning tooling marks, and can therefore easily confound metrology results involving diamond-turned components. Furthermore it was found that only moderate amounts of pupil vignetting, and errors in sampling ratio as low as 2% produced groove errors consistent in magnitude with typical diamond-turning specifications. This paper presents the results of this study on the magnitude and nature of these artifacts and their impact on telescope metrology.
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Thomas P. Zielinski and James R. Fienup "False diamond turning artifacts in phase retrieval results", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 773156 (9 August 2010); https://doi.org/10.1117/12.857274
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