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7 February 2003 Comparison of different 3D wavefront sensing and reconstruction techniques for MCAO
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The vertical distribution of the turbulence limits the field of view of classical adaptive optics due to the anisoplanatism. Multiconjugate adaptive optics (MCAO) uses several deformable mirrors conjugated to different layers in the atmosphere to overcome this effect. In the last few years, many studies and developments have been done regarding the analysis of the turbulence volume, and the choice of the wavefront reconstruction techniques.An extensive study of MCAO modelisation and performance estimation has been done at OAA and ONERA. The developed Monte Carlo codes allow to simulate and investigate many aspects: comparison of turbulence analysis strategies (tomography or layer oriented) and comparison of different reconstruction approaches. For instance in the layer oriented approach, the control for a given deformable mirror can be either deduced from the whole set of wavefront sensor measurements or only using the associated wavefront sensor. Numerical simulations are presented showing the advantages and disadvantages of these different options for several cases depending on the number, geometry and magnitude of the guide stars.
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Dolores Bello, Christophe Verinaud, Jean-Marc Conan, Thierry Fusco, Marcel Carbillet, and Simone Esposito "Comparison of different 3D wavefront sensing and reconstruction techniques for MCAO", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003);

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