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Rayleigh Scattering and Laser Spot Elongation Problems at ALFA (2000)

Viard, E. ; Delplancke, F. ; Hubin, N. ; [weitere]

Springer

Experimental astronomy 10 (2000), S. 123-133

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ISSN: 1572-9508

Schlagwort(e): adaptive optics ; laser guide star ; Rayleigh scattering ; spot elongation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract This article 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 ageneral AO simulation, provide the sensor sub-apertureimages. It is shown that the centroid measurement accuracyis affected by these phenomena. The simulation was made both for the ALFA system and for the VLT Nasmyth Adaptive Optics System (NAOS).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1008117126814

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