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7 July 2000 Isoplanatic angle and optimal guide star separation for multiconjugate adaptive optics
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We propose a first orae performance estimation of multiconjugate adaptive optics (MCAO) systems. An important and restrictive parameter is the angular guide star (GS) separation for a field of view (FOV) of interest to be compensated. An analytical approach is proposed to estimate the residual variance of a MCAO systems for a given position in the FOV as a function of GS separation. This approach allows us to define expected isoplanatic angles for MCAO systems as a function of the atmospheric and observing conditions (turbulence profile, telescope diameter and GS separation). The analytical results are also compared with the numerical simulation of a MCAO system, in which a great care has been taken in the 3D wavefront reconstruction from 2D wavefront sensor (WFS) measurements. For a 8 m telescope, we show that 3 GS's and 3 deformable mirrors provides very good performance in a 200 arcseconds FOV at 2.2 micrometer.
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Thierry Fusco, Jean-Marc Conan, Vincent Michau, Gerard Rousset, and Laurent M. Mugnier "Isoplanatic angle and optimal guide star separation for multiconjugate adaptive optics", Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000);

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