Scintillation and phase anisoplanatism in Shack-Hartmann wavefront sensing

Details Scintillation and phase anisoplanatism in Shack-Hartmann wavefront sensing Scintillation and phase anisoplanatism in Shack-Hartmann wavefront sensing

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006josaa..23..613r&link_type=abstract

Journal of the Optical Society of America A, vol. 23, Issue 3, pp.613-624

Physics

Optics

4

Atmospheric Turbulence, Wave-Front Sensing

Scientific paper

Adaptive optics provides a real-time compensation for atmospheric turbulence that severely limits the resolution of ground-based observation systems. The correction quality relies on a key component, that is, the wavefront sensor (WFS). When observing extended sources, WFS precision is limited by anisoplanatism effects. Anisoplanatism induces a variation of the turbulent phase and of the collected flux in the field of view. We study the effect of this phase and scintillation anisoplanatism on wavefront analysis. An analytical expression of the error induced is given in the Rytov regime. The formalism is applied to a solar and an endoatmospheric observation. Scintillation effects are generally disregarded, especially in astronomical conditions. We shall prove that this approximation is not valid with extended objects.

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