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Proceedings Paper

Non-invasive optical end-to-end test of a large TMA telescope (JWST) from the intermediate focus
Author(s): Tony Whitman; J. Scott Knight; Mark Waldman; Paul Lightsey
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Paper Abstract

The James Webb Space Telescope (JWST) requires testing of the full optical system in a cryogenic vacuum environment before launch. Challenges with the telescope architecture and the test environment lead to placing removable optical test sources at the Cassegrain intermediate focus of the Telescope. The Science Instrument suite will be used to align the telescope and to verify the wavefront error. The Science Instruments capture test images that are analyzed using focus diverse phase retrieval. The wavefront sensing algorithms have the large dynamic range required to measure the relatively small wavefronts of interest in the presence of the large aberrations resulting from the off-axis source locations at the intermediate focus. These inherent aberrations of the off-axis design are removed analytically from the measured data. The test design and in-situ wavefront sensing process enables a number of tests to verify the alignment and optical quality of the system.

Paper Details

Date Published: 26 August 2009
PDF: 8 pages
Proc. SPIE 7436, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts IV, 74360E (26 August 2009); doi: 10.1117/12.826493
Show Author Affiliations
Tony Whitman, ITT Corp. (United States)
J. Scott Knight, Ball Aerospace & Technologies Corp. (United States)
Mark Waldman, Sigma Space Corp. (United States)
Paul Lightsey, Ball Aerospace & Technologies Corp. (United States)

Published in SPIE Proceedings Vol. 7436:
UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts IV
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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