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Proceedings Paper

Retrieving the telescope and instrument static wavefront aberration with a phase diversity procedure using on-sky adaptive optics corrected images
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Paper Abstract

We present the results of a sky source based, phase diversity experiment at the W. M. Keck Observatory to retrieve the global wavefront static aberration from the telescope primary mirror to the science imager (NIRC2). The context of this study is a point spread function reconstruct (PSF-R) project for the Keck-II and Gemini- North adaptive optics systems. We demonstrate that if we select couples of in/out-of-focus PSF with identical seeing (determined with a deformable mirror based seeing monitor), retrieving the global static wavefront from AO corrected sky images is indeed possible. A sensitivity analysis shows that the reconstructed wavefront accuracy is very sensitive to errors in the knowledge of the system's optical parameters, and an accuracy of less than 1% is required. Recommendations for an accurate sky-based phase diversity static wavefront reconstruction are given, as well as our plan for the next steps of this project at the W. M. Keck Observatory.

Paper Details

Date Published: 13 September 2012
PDF: 12 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 844716 (13 September 2012); doi: 10.1117/12.926637
Show Author Affiliations
Laurent Jolissaint, aquilAOptics (Switzerland)
Laurent M. Mugnier, ONERA (France)
Chris Neyman, W. M. Keck Observatory (United States)
Julian Christou, Gemini Observatory (United States)
Peter Wizinowich, W. M. Keck Observatory (United States)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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