Physics – Optics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4007.1044f&link_type=abstract
Proc. SPIE Vol. 4007, p. 1044-1055, Adaptive Optical Systems Technology, Peter L. Wizinowich; Ed.
Physics
Optics
7
Scientific paper
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.
Conan Jean-Marc
Fusco Thierry
Michau Vincent
Mugnier Laurent M.
Rousset Gerard
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