Optical design and performance of the NGST wavefront control testbed

Peter Petrone III; 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

doi:10.1117/12.463280

5 March 2003 Optical design and performance of the NGST wavefront control testbed

Peter Petrone III, 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

Author Affiliations +

Proceedings Volume 4850, IR Space Telescopes and Instruments; (2003) https://doi.org/10.1117/12.463280
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

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Peter Petrone III, 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, and Barbara J. Zukowski "Optical design and performance of the NGST wavefront control testbed", Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); https://doi.org/10.1117/12.463280

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