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

Dekany, R. and Neyman, C. and Flicker, R. (2008) Sharpening of natural guide stars for low-order wavefront sensing using patrolling laser guide stars. In: Adaptive Optics Systems. Proceedings of SPIE. No.7015. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 701525. ISBN 9780819472250. https://resolver.caltech.edu/CaltechAUTHORS:20180530-105545916

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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.


Item Type:Book Section
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https://doi.org/10.1117/12.790171DOIArticle
Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). This research was carried out in support of the W. M. Keck Observatory Next Generation Adaptive Optics System preliminary design phase. We wish to acknowledge support for this effort from the National Science Foundation through the Telescope System Instrumentation Program (TSIP) and thank the technical staff at TMT for their support of the LAOS simulation code.
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Funding AgencyGrant Number
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Subject Keywords:Adaptive Optics, Laser Guide Star, wavefront sensing
Series Name:Proceedings of SPIE
Issue or Number:7015
Record Number:CaltechAUTHORS:20180530-105545916
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180530-105545916
Official Citation:R. Dekany, C. Neyman, R. Flicker, "Sharpening of natural guide stars for low-order wavefront sensing using patrolling laser guide stars", Proc. SPIE 7015, Adaptive Optics Systems, 701525 (10 July 2008); doi: 10.1117/12.790171; https://doi.org/10.1117/12.790171
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86709
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:30 May 2018 23:02
Last Modified:03 Nov 2019 18:45

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