Sodium beacon tip-tilt determination with Rayleigh-aided auxiliary telescope technique

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atmospheric Effects, Methods: Miscellaneous, Techniques: Miscellaneous, Telescopes

Scientific paper

The usefulness of tracking the Rayleigh portion of a mesospheric sodium laser guide star as reference for absolute tip-tilt recovery in the frame of the auxiliary telescopes technique is shown. This approach leads to the reduction of the ground occupation needed to attain a given sky coverage by more than one order of magnitude. Speed, tracking precision, and the number of auxiliary telescopes are also reduced, making this new approach a more attractive one. The use of a low-altitude Rayleigh spot reinforces the fundamental limitations affecting this and other techniques, thus degrading significantly the quality of the recovered tip-tilt. However, it is shown that, provided adequate care is taken in the collection and treatment of data, an interesting tilt signal can still be retrieved.

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