5 October 2016 Validation of tomographic laser guide star uplink tip-tilt determination with CANARY
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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.
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Andrew P. Reeves, Andrew P. Reeves, Timothy J. Morris, Timothy J. Morris, Richards M. Myers, Richards M. Myers, Alastair G. Basden, Alastair G. Basden, Eric Gendron, Eric Gendron, Carine Morel, Carine Morel, James Osborn, James Osborn, Gerard Rousset, Gerard Rousset, Fabrice Vidal, Fabrice Vidal, } "Validation of tomographic laser guide star uplink tip-tilt determination with CANARY", Proc. SPIE 9909, Adaptive Optics Systems V, 99091Y (5 October 2016); doi: 10.1117/12.2232395; https://doi.org/10.1117/12.2232395
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