Phase Retrieval Camera optical testing of the Advanced Mirror System Demonstrator (AMSD)

Catherine M. Ohara; Jessica A. Faust; Andrew E. Lowman; Joseph Jacob Green; David C. Redding; Scott A. Basinger; David Cohen; Fang Shi

doi:10.1117/12.551793

12 October 2004 Phase Retrieval Camera optical testing of the Advanced Mirror System Demonstrator (AMSD)

Catherine M. Ohara, Jessica A. Faust, Andrew E. Lowman, Joseph Jacob Green, David C. Redding, Scott A. Basinger, David Cohen, Fang Shi

Author Affiliations +

Proceedings Volume 5487, Optical, Infrared, and Millimeter Space Telescopes; (2004) https://doi.org/10.1117/12.551793
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The James Webb Space Telescope (JWST) will use image-based wavefront sensing to align the telescope optics and achieve diffraction-limited performance at 2 µm. The Phase Retrieval Camera (PRC) is a high-accuracy, image-based wavefront sensor that was built for the optical characterization of JWST technology-demonstrator mirrors. Recently, experiments with the PRC were performed at the NASA Marshall Space Flight Center to measure the cryogenic surface figure of the beryllium Advanced Mirror System Demonstrator (AMSD). This paper describes the results of these experiments. Using the Modified Gerchberg-Saxton phase retrieval algorithm (JWST’s baseline method for fine-phasing), the PRC measured wavefront aberrations that were as large as 10 waves peak-to-valley (wavefront) in the optical system. A comparison between the PRC results and measurements acquired with an Instantaneous Phase Interferometer will also be presented.

Citation Download Citation

Catherine M. Ohara, Jessica A. Faust, Andrew E. Lowman, Joseph Jacob Green, David C. Redding, Scott A. Basinger, David Cohen, and Fang Shi "Phase Retrieval Camera optical testing of the Advanced Mirror System Demonstrator (AMSD)", Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); https://doi.org/10.1117/12.551793

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