Segmented mirror coarse phasing with white light interferometry: modeling and experimenting on NGST's wavefront control testbed

Fang Shi; David C. Redding; Andrew E. Lowman; Catherine Mayumi Ohara; Laura A. Burns; Peter Petrone III; Charles W. Bowers; Scott A. Basinger

doi:10.1117/12.461127

5 March 2003 Segmented mirror coarse phasing with white light interferometry: modeling and experimenting on NGST's Wavefront Control Testbed

Fang Shi, David C. Redding, Andrew E. Lowman, Catherine Mayumi Ohara, Laura A. Burns, Peter Petrone III, Charles W. Bowers, Scott A. Basinger

Author Affiliations +

Proceedings Volume 4850, IR Space Telescopes and Instruments; (2003) https://doi.org/10.1117/12.461127
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

A method of coarse phasing segmented mirrors using white light interferometry (WLI) has been developed for the Next Generation Space Telescope (NGST) wavefront sensing and control. Using the broadband point PSF of the segmented mirrors taken during a segment piston scan, the WLI can accurately detect small residual piston errors. WLI does not rely on extra optics and uses only the final imaging camera. With its high sensitivity to small segment piston error WLI can be used as a complementary phasing algorithm to the dispersed fringe sensor (DFS) for NGST. This paper will present the results from modeling and experiment on the NGST's Wavefront Control Testbed (WCT).

Citation Download Citation

Fang Shi, David C. Redding, Andrew E. Lowman, Catherine Mayumi Ohara, Laura A. Burns, Peter Petrone III, Charles W. Bowers, and Scott A. Basinger "Segmented mirror coarse phasing with white light interferometry: modeling and experimenting on NGST's Wavefront Control Testbed", Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); https://doi.org/10.1117/12.461127

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