28 July 2000 Initial test results from the Next Generation Space Telescope (NGST) wavefront sensing and control testbed (WCT)
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Abstract
This paper describes the results of a few of the initial series of tests being conducted with the first configuration of the Next Generation Space Telescope Wavefront sensing and Control Testbed (WCT1). WCT1 is a 1:1, f/16.6 re-imaging system, incorporating two deformable mirrors located at pupil conjugate positions with 6 actuators/diameter (SM/DM) and 20 actuators/diameter (AO/DM). A CCD on a precision stage is used for obtaining defocused images providing phase diversity for wavefront determination using phase retrieval. In a typical experiment, wavefront error is injected into the optical path with the SM/DM and then corrected using the more densely actuated AO/DM. Wavefront analysis is provided via a phase retrieval algorithm, and control software is used to reshape the AO/DM and correct the wavefront. A summary of the results of some initial tests are presented.
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Charles W. Bowers, Pamela S. Davila, Bruce H. Dean, Brendon D. Perkins, Mark E. Wilson, David C. Redding, Scott A. Basinger, David Cohen, Andrew E. Lowman, Fang Shi, Laura A. Burns, Michael W. Fitzmaurice, Todd A. Norton, Peter Petrone, J. Ladd Wheeler, "Initial test results from the Next Generation Space Telescope (NGST) wavefront sensing and control testbed (WCT)", Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (28 July 2000); doi: 10.1117/12.393972; https://doi.org/10.1117/12.393972
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