Impact of Cn2 profile structure on wide-field AO performance

Thierry Fusco; Anne Costille

doi:10.1117/12.857489

27 July 2010 Impact of Cn2 profile structure on wide-field AO performance

Thierry Fusco, Anne Costille

Proceedings Volume 7736, Adaptive Optics Systems II; 77360J (2010) https://doi.org/10.1117/12.857489
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

WFAO systems are in their design phase for the ELTs. MCAO (MAORY), LTAO (ATLAS) and MOAO (EAGLE) approaches have been analyzed for the E-ELT. All these approaches require a precise tomographic reconstruction of the turbulent volume. In that frame, Cn² profiles come up at two levels: the input "true" profile, and the prior profile used as a regularization in the tomographic reconstruction. The impacts of the structure and the complexity of the Cn² profile on the residual error after tomographic reconstruction are analyzed and discussed. We show that isoplanatic angle is not sufficient to characterize profiles in WFAO. We highlight the importance of a well sampled Cn² input profile and prior profile to be considered in the tomographic reconstructor.

Citation Download Citation

Thierry Fusco and Anne Costille "Impact of Cn2 profile structure on wide-field AO performance", Proc. SPIE 7736, Adaptive Optics Systems II, 77360J (27 July 2010); https://doi.org/10.1117/12.857489

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