Wavefront Sensing on extended sources: Anisoplanatism Effects

Details Wavefront Sensing on extended sources: Anisoplanatism Effects Wavefront Sensing on extended sources: Anisoplanatism Effects

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..251v&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Physics

Optics

Scientific paper

Wavefront sensing is a case in point when dealing with Adaptive Optics (AO). Propagation path angular variation is responsible for decorrelation of the turbulence induced phase fluctuations in the field of view. On extended sources, this decorrelation called anisoplanatism is detrimental not only to wavefront correction but also to classical wavefront estimation. The case of the Shack-Hartmann wavefront sensor (SH WFS) is tackled. Using Rytov approximation the anisoplanatism error on the estimated phase is analytically quantified. Excellent adequation with end to end simulation results is achieved in a typical solar observation case.

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