LGS Na spot elongation and Rayleigh scattering effects on Shack-Hartmann wavefront sensor performances

Details LGS Na spot elongation and Rayleigh scattering effects on Shack-Hartmann wavefront sensor performances LGS Na spot elongation and Rayleigh scattering effects on Shack-Hartmann wavefront sensor performances

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3762....8v&link_type=abstract

Proc. SPIE Vol. 3762, p. 8-19, Adaptive Optics Systems and Technology, Robert K. Tyson; Robert Q. Fugate; Eds.

Physics

Optics

2

Scientific paper

This paper describes the effects of Laser Guide Star spot elongation and Rayleigh scattering on wavefront sensing performances. An analytical model of Rayleigh scattering and a numerical model of laser plume generation at the altitude of the atmospheric sodium layer were developed. These models, integrated into a general Adaptive Optics (AO) simulation, provide information about the non-uniform centroid measurement accuracy on the sensor sub-apertures. The effects of laser power, laser type, laser launching position, sensor sampling and sensor field of view on the AO loop performances are analyzed and discussed.

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