Anisoplanatism in Shack-Hartmann wavefront sensing

Details Anisoplanatism in Shack-Hartmann wavefront sensing Anisoplanatism in Shack-Hartmann wavefront sensing

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5572..223r&link_type=abstract

Optics in Atmospheric Propagation and Adaptive Systems VII. Edited by Gonglewski, John D.; Stein, Karin. Proceedings of the SP

Physics

Optics

Scientific paper

Anisoplanatism refers to the angular decorrelation of the waves. We are concerned with the impact of anisoplanatism in the accuracy of Shack-Hartmann wavefront sensing using extended sources possibly larger than the isoplanatic patch. We have used an end-to-end numerical simulation linking propagation through turbulence and Shack-Hartmann wavefront sensing. For an extended source, the wavefront error is found to be larger than the sum of the individual errors due to scintillation and phase effects, as a consequence of the correlation between the two. An analytical formulation is proposed to predict the Shack-Hartmann wavefront measurement error on a double star. We are albe to successfully estimate the wavefront slope error despite the negligible correlation between scintillation and phase effects.

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