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