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Proceedings Paper

Focus and pointing adjustments necessary for laser guide star adaptive optics at the W.M. Keck Observatory
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Paper Abstract

The W. M. Keck Observatory Adaptive Optics (AO) team recently celebrated a milestone first AO-corrected image with the new Laser Guide Star (LGS) system. This paper details focus and pointing changes implemented for the LGS AO system. The combination of variable sodium altitude, elevation-dependent distance to the LGS, off-axis projection, and equipment flexure require both focus and pointing adjustments to keep the laser spot located and its size minimized on the wavefront sensor. We will describe the current approach to LGS focus and pointing-compensation adjustments, and provide some insight into issues seen thus far during engineering activities at the W. M. Keck Observatory.

Paper Details

Date Published: 25 October 2004
PDF: 12 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.553060
Show Author Affiliations
Douglas Summers, W.M. Keck Observatory (United States)
Antonin H. Bouchez, W.M. Keck Observatory (United States)
Jason Chin, W.M. Keck Observatory (United States)
Adam Contos, Ball Aerospace & Technologies Corp. (United States)
Scott Hartman, W.M. Keck Observatory (United States)
Erik Johansson, W.M. Keck Observatory (United States)
Robert Lafon, W.M. Keck Observatory (United States)
David Le Mignant, W.M. Keck Observatory (United States)
Paul Stomski, W.M. Keck Observatory (United States)
Marcos A. van Dam, Lawrence Livermore National Lab. (United States)
Peter L. Wizinowich, W.M. Keck Observatory (United States)

Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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