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Proceedings Paper

Initial test results from the Next Generation Space Telescope (NGST) wavefront sensing and control testbed (WCT)
Author(s): 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
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Paper 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.

Paper Details

Date Published: 28 July 2000
PDF: 11 pages
Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (28 July 2000); doi: 10.1117/12.393972
Show Author Affiliations
Charles W. Bowers, NASA Goddard Space Flight Ctr. (United States)
Pamela S. Davila, NASA Goddard Space Flight Ctr. (United States)
Bruce H. Dean, NASA Goddard Space Flight Ctr. (United States)
Brendon D. Perkins, NASA Goddard Space Flight Ctr. (United States)
Mark E. Wilson, NASA Goddard Space Flight Ctr. (United States)
David C. Redding, Jet Propulsion Lab. (United States)
Scott A. Basinger, Jet Propulsion Lab. (United States)
David Cohen, Jet Propulsion Lab. (United States)
Andrew E. Lowman, Jet Propulsion Lab. (United States)
Fang Shi, Jet Propulsion Lab. (United States)
Laura A. Burns, Science Systems Applications, Inc. (United States)
Michael W. Fitzmaurice, Swales and Associates, Inc. (United States)
Todd A. Norton, Swales and Associates, Inc. (United States)
Peter Petrone, NSI Technical Services Corp. (United States)
J. Ladd Wheeler, The Hammers Corp. (United States)


Published in SPIE Proceedings Vol. 4013:
UV, Optical, and IR Space Telescopes and Instruments
James B. Breckinridge; Peter Jakobsen, Editor(s)

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