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Proceedings Paper

Validation of tomographic laser guide star uplink tip-tilt determination with CANARY
Author(s): Andrew P. Reeves; Timothy J. Morris; Richards M. Myers; Alastair G. Basden; Eric Gendron; Carine Morel; James Osborn; Gerard Rousset; Fabrice Vidal
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Paper Abstract

Laser Guide Stars (LGS) have greatly increased the sky-coverage of Adaptive Optics (AO) systems. Due to the up-link turbulence experienced by LGSs, a Natural Guide Star (NGS) is still required, limiting sky-coverage. A method has recently been presented that promises to determine the LGS uplink tip-tilt in tomographic LGS AO systems by using the fact that each LGS Wave Front Sensor (WFS) in a tomographic AO system observes the uplink path of other LGSs. Such a technique has the potential to greatly increase the sky-coverage of Multi- Object, Laser Tomographic and Multi-Conjugate AO systems by allowed further off-axis NGS tip-tilt stars to be used for correction. Here we use an approach based on phase gradient covariance matrices to create on-sky capable tomographic reconstructors that account for some tip-tilt from LGS WFSs. We present analysis of open loop wave front sensor data from the CANARY Multi-Object AO demonstrator, providing early validation for the technique.

Paper Details

Date Published: 5 October 2016
PDF: 7 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99091Y (5 October 2016); doi: 10.1117/12.2232395
Show Author Affiliations
Andrew P. Reeves, Durham Univ. (United Kingdom)
Timothy J. Morris, Durham Univ. (United Kingdom)
Richards M. Myers, Durham Univ. (United Kingdom)
Alastair G. Basden, Durham Univ. (United Kingdom)
Eric Gendron, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris (France)
Carine Morel, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris (France)
James Osborn, Durham Univ. (United Kingdom)
Gerard Rousset, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris (France)
Fabrice Vidal, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris (France)


Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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