Anisoplanatism effects in Shack-Hartmann Wave Front Sensing with Laser Guide Stars on the ELTs
Onera, DOTA / HRA, Chatillon, France
2 Groupement d’Interet Scientifique PHASE (Partenariat Haute resolution Angulaire Sol Espace) between Onera, Observatoire de Paris, CNRS and Universite Paris Diderot
3 Observatoire de Paris-Meudon, LESIA, Meudon, France
a e-mail: firstname.lastname@example.org
Laser Guide Stars aim at increasing the sky coverage, highly restricted when using Adaptive Optics with Natural Guide Stars. With such an artificial object, spot elongation may be a limitation for the measurement quality when using a Wave Front Sensor. In this document, we evaluate and discuss the effects of this limitation on wave front measurements, for a 40 m class telescope. We also explore the possibilities of taking these effects into account in the wave front reconstruction.
© Owned by the authors, published by EDP Sciences, 2010