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Proceedings Paper

Natural guide-star processing for wide-field laser-assisted AO systems
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Paper Abstract

Sky-coverage in laser-assisted AO observations largely depends on the system's capability to guide on the faintest natural guide-stars possible. Here we give an up-to-date status of our natural guide-star processing tailored to the European-ELT's visible and near-infrared (0.47 to 2.45 μm) integral field spectrograph — Harmoni.

We tour the processing of both the isoplanatic and anisoplanatic tilt modes using the spatio-angular approach whereby the wavefront is estimated directly in the pupil plane avoiding a cumbersome explicit layered estimation on the 35-layer profiles we're currently using.

Taking the case of Harmoni, we cover the choice of wave-front sensors, the number and field location of guide-stars, the optimised algorithms to beat down angular anisoplanatism and the performance obtained with different temporal controllers under split high-order/low-order tomography or joint tomography. We consider both atmospheric and far greater telescope wind buffeting disturbances. In addition we provide the sky-coverage estimates thus obtained.

Paper Details

Date Published: 27 July 2016
PDF: 13 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99094H (27 July 2016); doi: 10.1117/12.2232918
Show Author Affiliations
Carlos M. Correia, Aix Marseille Univ., CNRS, LAM (France)
Benoit Neichel, Aix Marseille Univ., CNRS, LAM (France)
Jean-Marc Conan, ONERA (France)
Cyril Petit, ONERA (France)
Jean-Francois Sauvage, Aix Marseille Univ., CNRS, LAM (France)
ONERA (France)
Thierry Fusco, Aix Marseille Univ., CNRS, LAM (France)
ONERA (France)
Joel D. R. Vernet, European Southern Observatory (Germany)
Niranjan Thatte, Univ. of Oxford (United Kingdom)


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

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