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Proceedings Paper

Sharpening of natural guide stars for low-order wavefront sensing using patrolling laser guide stars
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Paper Abstract

A laser guide star (LGS) adaptive optics (AO) system generally requires additional tip/tilt information derived using a natural guide star (NGS), while multi-LGS systems will benefit from measurement of additional low-order wavefront modes using one or more NGS's. If we use AO sharpened NGS's, we can improve both the measurement accuracy and accessible sky fraction while also minimizing the observational overhead of faint NGS acquisition. Multi-object adaptive optics (MOAO) sharpening of NGS is possible where a good estimate of the NGS wavefront can be made, for example where tomographic wavefront information is available. We describe a new approach for high Strehl ratio sharpening, based on additional patrolling laser beacons, to eliminate generalized anisoplanatism and minimize tomography error in the NGS direction.

Paper Details

Date Published: 10 July 2008
PDF: 10 pages
Proc. SPIE 7015, Adaptive Optics Systems, 701525 (10 July 2008); doi: 10.1117/12.790171
Show Author Affiliations
R. Dekany, California Institute of Technology (United States)
C. Neyman, W. M. Keck Observatory (United States)
R. Flicker, W. M. Keck Observatory (United States)

Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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