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

Miska Le Louarn; Norbert N. Hubin; Renaud Foy; Michel Tallon

doi:10.1117/12.321752

11 September 1998 Sky coverage and PSF shape with LGS AO on 8-m telescopes

Miska Le Louarn, Norbert N. Hubin, Renaud Foy, Michel Tallon

Proceedings Volume 3353, Adaptive Optical System Technologies; (1998) https://doi.org/10.1117/12.321752
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

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.

Citation Download Citation

Miska Le Louarn, Norbert N. Hubin, Renaud Foy, and Michel Tallon "Sky coverage and PSF shape with LGS AO on 8-m telescopes", Proc. SPIE 3353, Adaptive Optical System Technologies, (11 September 1998); https://doi.org/10.1117/12.321752

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