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Proceedings Paper

Sky coverage and PSF shape with LGS AO on 8-m telescopes
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Paper Abstract

We have analytically modeled the performances of a natural guide star and laser guide star adaptive optics system. The performance in terms of Strehl radio in J, H and K bands are presented for two atmospheric models. We use this model to derive values of sky coverage for both systems following two methods. The first one is statistical and uses a model of our Galaxy to give the stellar densities and the AO model to compute the off-axis performances. The second model uses a cross correlation of catalogues of astrophysical objects and reference stars. This gives the number of objects of a given kind that can be observed with a given Strehl. We have also modeled the PSF of a laser guide star system using the modal decomposition of the cone effect and the effect of tilt isoplanatism. It can be seen that the PSF from an LGS system differs significantly from that of a conventional AO system.

Paper Details

Date Published: 11 September 1998
PDF: 7 pages
Proc. SPIE 3353, Adaptive Optical System Technologies, (11 September 1998); doi: 10.1117/12.321752
Show Author Affiliations
Miska Le Louarn, European Southern Observatory and CRAL/Observatorie de Lyon (Germany)
Norbert N. Hubin, European Southern Observatory (Germany)
Renaud Foy, CRAL/Observatoire de Lyon (France)
Michel Tallon, CRAL/Observatoire de Lyon (France)


Published in SPIE Proceedings Vol. 3353:
Adaptive Optical System Technologies
Domenico Bonaccini; Robert K. Tyson, Editor(s)

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