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Proceedings Paper

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

Paper Details

Date Published: 12 October 2004
PDF: 9 pages
Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); doi: 10.1117/12.551793
Show Author Affiliations
Catherine M. Ohara, Jet Propulsion Lab. (United States)
Jessica A. Faust, Jet Propulsion Lab. (United States)
Andrew E. Lowman, Jet Propulsion Lab. (United States)
Joseph Jacob Green, Jet Propulsion Lab. (United States)
David C. Redding, Jet Propulsion Lab. (United States)
Scott A. Basinger, Jet Propulsion Lab. (United States)
David Cohen, Jet Propulsion Lab. (United States)
Fang Shi, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5487:
Optical, Infrared, and Millimeter Space Telescopes
John C. Mather, Editor(s)

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