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7 February 2003 Layer oriented multiconjugate adaptive optics systems: performance analysis by numerical simulations
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The multi-conjugate adaptive optics (MCAO) technique allows to correct the vertical distribution of atmospheric turbulence, extending the isoplanatic angle and the sky coverage. In the Layer-Oriented (LO) approach, each wavefront sensor (WFS) is conjugated to a given atmospheric layer and is linked in closed loop to a deformable mirror, conjugated to the same height. This technique benefits from the co-adding of light coming from the guide stars which can be arbitrarily numerous and faint. In the Multiple Field of View (MFoV) scheme, each LO WFS is looking through a different field-of-view (FoV) in order to extend even further the sky coverage by increasing the photon density in the various layers. With the help of the Software Package CAOS, upgraded with numerical tools dedicated to MCAO and LO, we simulate the whole wavefront sensing process of a LO system based on pyramid sensors. We describe the modelization of the phenomena occurring during the sensing, such as diffraction effects, and detector noise. Furthermore we also use an independent ad hoc code in order to analyze the performance of the MFoV scheme. The performances are given considering realistic natural guide star (NGS) configurations.
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Christophe Verinaud, Carmelo Arcidiacono, Marcel Carbillet, Emiliano Diolaiti, Roberto Ragazzoni, Elise Vernet-Viard, and Simone Esposito "Layer oriented multiconjugate adaptive optics systems: performance analysis by numerical simulations", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003);

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