Closed-loop tomographic control on HOMER wide-field AO bench: experimental results and identification issues

Amelie Parisot; Anne Costille; Cyril Petit; Thierry Fusco

doi:10.1117/12.856980

27 July 2010 Closed-loop tomographic control on HOMER wide-field AO bench: experimental results and identification issues

Amelie Parisot, Anne Costille, Cyril Petit, Thierry Fusco

Author Affiliations +

Proceedings Volume 7736, Adaptive Optics Systems II; 773637 (2010) https://doi.org/10.1117/12.856980
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Adaptive Optics (AO) has a limited corrected field of view because of the anisoplanatism effect. Wide Field AO (WFAO) concepts, such as Multi-Conjugate AO (MCAO), have been developed to overcome this limitation. These complex WFAO systems raise critical challenges such as tomographic control and calibrations. We present new results obtained in closed-loop configuration with the laboratory bench HOMER which is devoted to implementation and validation of these WFAO concepts in the perspective of future VLT/ELT AO systems. Turbulence is generated with rotating phase screens and multi-directional analysis is performed. Tomographic control relies on Linear Quadratic Gaussian control (LQG). The correction can be applied thanks to two Deformable Mirrors (DM). We also focus on calibration issues and models identification. We investigate in particular identification of relative geometry of the wave front sensors, DM altitude and asterism and its impact on performance.

Citation Download Citation

Amelie Parisot, Anne Costille, Cyril Petit, and Thierry Fusco "Closed-loop tomographic control on HOMER wide-field AO bench: experimental results and identification issues", Proc. SPIE 7736, Adaptive Optics Systems II, 773637 (27 July 2010); https://doi.org/10.1117/12.856980

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