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Characterization and mitigation of Laser–Guide–Star–induced aberrations
1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes
Sodium Laser Guide Stars (LGS) induce optical aberrations in adaptive optics (AO) systems. The artificial star is elongated due to the sodium layer thickness, and the variations of the sodium layer altitude and atom density profile induce errors on centroid measurements of elongated spots. In AO systems, these errors generate spurious optical aberrations, termed LGS aberrations, especially with ELTs for which the spot elongation is greater. According to analytical models and experimentaldoi:10.1051/ao4elt/201005016 fatcat:bs7uldpvkbaj7ifos6jl5udjay