Communication Dans Un Congrès Année : 2016

Validation of tomographic laser guide star uplink tip-tilt determination with CANARY

Résumé

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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Dates et versions

hal-03743427 , version 1 (02-08-2022)

Identifiants

Citer

Andrew P. Reeves, Timothy J. Morris, Richard M. Myers, Alistair G. Basden, Éric Gendron, et al.. Validation of tomographic laser guide star uplink tip-tilt determination with CANARY. Adaptive Optics Systems V, Jun 2016, Edinburgh, United Kingdom. pp.99091Y 1-7, ⟨10.1117/12.2232395⟩. ⟨hal-03743427⟩
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