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Proceedings Paper

New wavefront sensing concepts for adaptive optics instrumentation
Author(s): K. El Hadi; M. Gray; T. Fusco; B. Le Roux
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Paper Abstract

For the last few years, Laboratory of Astrophysics of Marseille has been carrying out several R and D activities in Adaptive Optics (AO) instrumentation for Extremely Large Telescopes (ELTs). In the European ELT (D = 40 m) framework, both theoretical and experimental studies are jointly led. A new theoretical approach for AO control command law with large degrees of freedom is being developed: it is based on the use of Local Ensemble Transform Kalman Filter (Local ETKF). In parallel, an experimental multi-purpose AO bench is mounted to allow the validation of new wave-front sensing and correction concepts dedicated to the next generation of ELTs. All the main AO components, with a large number of spatial (up to thousand) and/or temporal (up to 1.5 kHz) frequencies, are available. From different combinations of these AO elements, several correction and sensing (low order and high order frequencies) studies are possible. Our AO bench is combining different corrector mirrors (MEMS deformable mirror from Boston Micromachines and Spatial Light Modulator from Holoeye) which can be used with Shack-Hartmann and Pyramid Wave Front Sensors (respectively, SHWFS and PWFS). For this last type of sensor (PWFS), we will use the world’s fastest and most sensitive camera system OCAM2 (developed at LAM), to demonstrate the concept of a fast and hyper-sensitive PWFS (up to 100x100 sub-pupils) dedicated to the first generation instruments for ELTs.

Paper Details

Date Published: 1 November 2012
PDF: 10 pages
Proc. SPIE 8535, Optics in Atmospheric Propagation and Adaptive Systems XV, 85350J (1 November 2012); doi: 10.1117/12.974531
Show Author Affiliations
K. El Hadi, Lab. d'Astrophysique de Marseille, CRNS, Aix-Marseille Univ. (France)
M. Gray, Lab. d'Astrophysique de Marseille, CRNS, Aix-Marseille Univ. (France)
T. Fusco, ONERA (France)
Lab. d'Astrophysique de Marseille, CRNS, Aix-Marseille Univ. (France)
B. Le Roux, Lab. d'Astrophysique de Marseille, CRNS, Aix-Marseille Univ. (France)


Published in SPIE Proceedings Vol. 8535:
Optics in Atmospheric Propagation and Adaptive Systems XV
Karin Stein; John Gonglewski, Editor(s)

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