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, Thierry Fusco, Jean-Marc Conan, Jean-Marc Conan, Vincent Michau, Vincent Michau, Gerard Rousset, Gerard Rousset, Laurent M. Mugnier, Laurent M. Mugnier, } "Isoplanatic angle and optimal guide star separation for multiconjugate adaptive optics", Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390292; https://doi.org/10.1117/12.390292


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