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Proceedings Article

Anisoplanatism in Shack-Hartmann wavefront sensing

[+] Author Affiliations
Clelia Robert, Jean-Marc Conan, Vincent Michau, Thierry Fusco

ONERA (France)

Proc. SPIE 5572, Optics in Atmospheric Propagation and Adaptive Systems VII, 223 (November 11, 2004); doi:10.1117/12.564642
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From Conference Volume 5572

  • Optics in Atmospheric Propagation and Adaptive Systems VII
  • John D. Gonglewski; Karin Stein
  • Maspalomas, Canary Islands, Spain | September 13, 2004

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.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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, 223 (November 11, 2004); doi:10.1117/12.564642; http://dx.doi.org/10.1117/12.564642


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