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

Douglas Summers; Antonin H. Bouchez; Jason Chin; Adam Contos; Scott Hartman; Erik Johansson; Robert Lafon; David Le Mignant; Paul Stomski; Marcos A. van Dam; Peter L. Wizinowich

doi:10.1117/12.553060

25 October 2004 Focus and pointing adjustments necessary for laser guide star adaptive optics at the W.M. Keck Observatory

Douglas Summers, Antonin H. Bouchez, Jason Chin, Adam Contos, Scott Hartman, Erik Johansson, Robert Lafon, David Le Mignant, Paul Stomski, Marcos A. van Dam, Peter L. Wizinowich

Author Affiliations +

Proceedings Volume 5490, Advancements in Adaptive Optics; (2004) https://doi.org/10.1117/12.553060
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

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.

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Douglas Summers, Antonin H. Bouchez, Jason Chin, Adam Contos, Scott Hartman, Erik Johansson, Robert Lafon, David Le Mignant, Paul Stomski, Marcos A. van Dam, and Peter L. Wizinowich "Focus and pointing adjustments necessary for laser guide star adaptive optics at the W.M. Keck Observatory", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); https://doi.org/10.1117/12.553060

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