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Proceedings Paper

Optical design and performance of the NGST wavefront control testbed
Author(s): Peter Petrone; Scott A. Basinger; Laura A. Burns; Charles W. Bowers; Andrew Chu; David Cohen; Pamela S. Davila; Bruce H. Dean; Peter Dogota; Michael W. Fitzmaurice; Joseph Jacob Green; Kong Ha; William L. Hayden; Don J. Lindler; Andrew E. Lowman; Catherine Mayumi Ohara; Mark E. Wilson; David C. Redding; Fang Shi; Barbara J. Zukowski
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Paper Abstract

The NGST Wavefront Control Testbed (WCT) is a joint technology program managed by the Goddard Space Flight Center (GSFC) and the Jet Propulsion Laboratory (JPL) for the purpose of developing technologies relevant to the NGST optical system. The WCT provides a flexible testing environment that supports the development of wavefront sensing and control algorithms that may be used to align and control a segmented optical system. WCT is a modular system consisting of a Source Module (SM), Telescope Simulator Module (TSM) and an Aft-Optics (AO) bench. The SM incorporates multiple sources, neutral density filters and bandpass filters to provide a customized point source for the TSM. The telescope simulator module contains a flip-in mirror that selects between a small deformable mirror and three actively controlled spherical mirror segments. The TSM is capable of delivering a wide range of aberrated, unaberrated, continuous and segmented wavefronts to the AO optical bench for analysis. The AO bench consists of a series of reflective and transmissive optics that images the exit pupil of the TSM onto a 349 actuator deformable mirror that is used for wavefront correction. A Fast Steering Mirror (FSM) may be inserted into the system (AO bench) to investigate image stability and to compensate for systematic jitter when operated in a closed loop mode. We will describe the optical design and performance of the WCT hardware and discuss the impact of environmental factors on system performance.

Paper Details

Date Published: 5 March 2003
PDF: 9 pages
Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); doi: 10.1117/12.463280
Show Author Affiliations
Peter Petrone, ManTech Systems Engineering Corp. (United States)
Scott A. Basinger, Jet Propulsion Lab. (United States)
Laura A. Burns, Science Systems and Applications, Inc. (United States)
Charles W. Bowers, NASA Goddard Space Flight Ctr. (United States)
Andrew Chu, Sigma Space Corp. (United States)
David Cohen, Jet Propulsion Lab. (United States)
Pamela S. Davila, NASA Goddard Space Flight Ctr. (United States)
Bruce H. Dean, NASA Goddard Space Flight Ctr. (United States)
Peter Dogota, Sigma Space Corp. (United States)
Michael W. Fitzmaurice, Swales Aerospace (United States)
Joseph Jacob Green, Jet Propulsion Lab. (United States)
Kong Ha, Jackson and Tull (United States)
William L. Hayden, NASA Goddard Space Flight Ctr. (United States)
Don J. Lindler, NASA Goddard Space Flight Ctr. (United States)
Andrew E. Lowman, Jet Propulsion Lab. (United States)
Catherine Mayumi Ohara, Jet Propulsion Lab. (United States)
Mark E. Wilson, NASA Goddard Space Flight Ctr. (United States)
David C. Redding, Jet Propulsion Lab. (United States)
Fang Shi, Jet Propulsion Lab. (United States)
Barbara J. Zukowski, Swales Aerospace (United States)


Published in SPIE Proceedings Vol. 4850:
IR Space Telescopes and Instruments
John C. Mather, Editor(s)

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