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Proceedings Paper

Wavefront control for the Gemini Planet Imager
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Paper Abstract

The wavefront control strategy for the proposed Gemini Planet Imager, an extreme adaptive optics coronagraph for planet detection, is presented. Two key parts of this strategy are experimentally verified in a testbed at the Laboratory for Adaptive Optics, which features a 32 × 32 MEMS device. Detailed analytic models and algorithms for Shack-Hartmann wavefront sensor alignment and calibration are presented. It is demonstrated that with these procedures, the spatially filtered WFS and the Fourier Transform reconstructor can be used to flatten to the MEMS to 1 nm RMS in the controllable band. Performance is further improved using the technique of modifying the reference slopes using a measurement of the static wavefront error in the science leg.

Paper Details

Date Published: 27 June 2006
PDF: 12 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62721N (27 June 2006); doi: 10.1117/12.672328
Show Author Affiliations
Lisa A. Poyneer, Lawrence Livermore National Lab. (United States)
Jean-Pierre Véran, Herzberg Institute of Astrophysics (Canada)
Daren Dillon, UCO Lick Observatory, Univ. of California, Santa Cruz (United States)
Scott Severson, UCO Lick Observatory, Univ. of California, Santa Cruz (United States)
Bruce A. Macintosh, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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