Anisoplanatism in Shack-Hartmann wavefront sensing

Clelia Robert; Jean-Marc Conan; Vincent Michau; Thierry Fusco

doi:10.1117/12.564642

11 November 2004 Anisoplanatism in Shack-Hartmann wavefront sensing

Clelia Robert, Jean-Marc Conan, Vincent Michau, Thierry Fusco

Proceedings Volume 5572, Optics in Atmospheric Propagation and Adaptive Systems VII; (2004) https://doi.org/10.1117/12.564642
Event: Remote Sensing, 2004, Maspalomas, Canary Islands, Spain

Abstract

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.

Citation Download Citation

Clelia Robert, Jean-Marc Conan, Vincent Michau, and Thierry Fusco "Anisoplanatism in Shack-Hartmann wavefront sensing", Proc. SPIE 5572, Optics in Atmospheric Propagation and Adaptive Systems VII, (11 November 2004); https://doi.org/10.1117/12.564642

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