The center of curvature optical assembly for the JWST primary mirror cryogenic optical test: optical verification

Conrad Wells; Gene Olczak; Cormic Merle; Tom Dey; Mark Waldman; Tony Whitman; Eric Wick; Aaron Peer

doi:10.1117/12.861874

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2 August 2010 The center of curvature optical assembly for the JWST primary mirror cryogenic optical test: optical verification

Conrad Wells, Gene Olczak, Cormic Merle, Tom Dey, Mark Waldman, Tony Whitman, Eric Wick, Aaron Peer

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Proceedings Volume 7790, Interferometry XV: Techniques and Analysis; 779003 (2010) https://doi.org/10.1117/12.861874
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

The James Webb Space Telescope (JWST) Optical Telescope Element (OTE) consists of a 6.6 m clear aperture, allreflective, three-mirror anastigmat. The 18-segment primary mirror (PM) presents unique and challenging assembly, integration, alignment and testing requirements. A full aperture center of curvature optical test is performed in cryogenic vacuum conditions at the integrated observatory level to verify PM performance requirements. The Center of Curvature Optical Assembly (CoCOA), designed and being built by ITT satisfies the requirements for this test. The CoCOA contains a multi wave interferometer, patented reflective null lens, actuation for alignment, full in situ calibration capability, coarse and fine alignment sensing systems, as well as a system for monitoring changes in the PM to CoCOA distance. Two wave front calibration tests are utilized to verify the low and Mid/High spatial frequencies, overcoming the limitations of the standard null/hologram configuration in its ability to resolve mid and high spatial frequencies. This paper will introduce the systems level architecture and optical test layout for the CoCOA.

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Conrad Wells, Gene Olczak, Cormic Merle, Tom Dey, Mark Waldman, Tony Whitman, Eric Wick, and Aaron Peer "The center of curvature optical assembly for the JWST primary mirror cryogenic optical test: optical verification", Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 779003 (2 August 2010); https://doi.org/10.1117/12.861874

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