Rayleigh scattering and laser spot elongation problems at ALFA

Details Rayleigh scattering and laser spot elongation problems at ALFA Rayleigh scattering and laser spot elongation problems at ALFA

1999-11-05

arxiv.org/abs/astro-ph/9911086v1

Exper.Astron. 10 (2000) 123-133

Astronomy and Astrophysics

Astrophysics

12 pages, accepted in Experimental Astronomy (special issue about ALFA). A version with full resolution images can be obtained

Scientific paper

This paper describes the qualitative effects of LGS spot elongation and Rayleigh scattering on ALFA wavefront sensor images. An analytical model of Rayleigh scattering and a numerical model of laser plume generation at the altitude of the Na-layer were developed. These models, integrated into a general AO simulation, provide the sensor sub-aperture images. It is shown that the centroid measurement accuracy is affected by these phenomena. The simulation was made both for the ALFA system and for the VLT Nasmyth Adaptive Optics System (NAOS).

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