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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...

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