The W. M. Keck Observatory Laser Guide Star Adaptive Optics System: Performance Characterization
Publications of the Astronomical Society of the Pacific2006Vol. 118(840), pp. 310–318
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Marcos A. van Dam, Antonin Bouchez, D. Le Mignant, Erik M. Johansson, Peter Wizinowich, Randy Campbell, Jason Chin, Scott Hartman, Robert Lafon, Paul J. Stomski, Douglas M. Summers
Abstract
The Keck II Telescope is the first 8–10 m class telescope equipped with a laser guide star adaptive optics (LGS AO) system. Under normal seeing conditions, the LGS AO system produces K‐band Strehl ratios between 30% and 40% using bright tip‐tilt guide stars, and it works well with tip‐tilt guide stars as faint as mR = 18, with partial correction for stars up to a magnitude fainter. This paper presents the algorithms implemented in the LGS AO system, as well as experimental performance results. A detailed error budget shows excellent agreement between the measured and expected image quality for both bright and faint guide stars.
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