Analysis of Wavefront sensing components for Ground Layer Adaptive Optics.

Details Analysis of Wavefront sensing components for Ground Layer Adaptive Optics. Analysis of Wavefront sensing components for Ground Layer Adaptive Optics.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..167n&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Physics

Optics

Scientific paper

Adaptive Optics isoplanatical field is limited to a few tens of arcseconds by the angular decorrelation of turbulent wavefronts. The concept of Multi-Conjugated Adaptive Optics (MCAO) have been proposed in order to enlarge this corrected field. This is made possible by using several guide stars for the phase perturbation measurement. Various concepts of MCAO have been developed, each one leading to specific requirements for the system dedicated to the phase perturbation analysis. One charactirizes here the wavefront measurement requirements of one of these systems, allowing correction of the turbulence located close to the telescope ("Ground Layer AO"). Influence of the number of guides stars used for the wavefront analysis and effects of some differences of magnitudes between them are studied for various wavefront analysis strategies.

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