High-precision metrology on the ultra-lightweight UV 51-cm f/1.25 parabolic SHARPI primary mirror using a CGH null lens

Scott Antonille; David A. Content; Doug Rabin; Thomas Wallace; Craig Stevens

doi:10.1117/12.552614

24 September 2004 High-precision metrology on the ultra-lightweight UV 51-cm f/1.25 parabolic SHARPI primary mirror using a CGH null lens

Scott Antonille, David A. Content, Doug Rabin, Thomas Wallace, Craig Stevens

Author Affiliations +

Proceedings Volume 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes; (2004) https://doi.org/10.1117/12.552614
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

For potential use on the SHARPI mission, Eastman Kodak has delivered a 50.8cm CA f/1.25 ultra-lightweight UV parabolic mirror with a surface figure error requirement of 6nm RMS. We address the challenges involved in verifying and mapping the surface error of this large lightweight mirror to 3nm RMS using a diffractive CGH null lens. Of main concern is removal of large systematic errors resulting from surface deflections of the mirror due to gravity as well as smaller contributions from system misalignment and reference optic errors. We present our efforts to characterize these errors and remove their wavefront error contribution in post-processing as well as minimizing the uncertainty these calculations introduce. Data from Kodak and preliminary measurements from NASA Goddard will be included.

Citation Download Citation

Scott Antonille, David A. Content, Doug Rabin, Thomas Wallace, and Craig Stevens "High-precision metrology on the ultra-lightweight UV 51-cm f/1.25 parabolic SHARPI primary mirror using a CGH null lens", Proc. SPIE 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes, (24 September 2004); https://doi.org/10.1117/12.552614

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