Anisoplanatism effects in Shack-Hartmann Wave Front Sensing with Laser Guide Stars on the ELTs

N. Muller; C. Robert; V. Michau; T. Fusco; C. Petit; J.-M. Conan; N. Vedrenne; G. Rousset

doi:10.1051/ao4elt/201005015

All issues

Year: 2010

10.1051/ao4elt/201005015

Abstract

Open Access

Issue		2010


Article Number		05015
Number of page(s)		6
Section		Wave front sensing
DOI		https://doi.org/10.1051/ao4elt/201005015
Published online		24 February 2010

1st AO4ELT conference, 05015 (2010)

Anisoplanatism effects in Shack-Hartmann Wave Front Sensing with Laser Guide Stars on the ELTs

N. Muller¹^,2^a, C. Robert¹, V. Michau¹, T. Fusco¹, C. Petit¹, J.-M. Conan¹, N. Vedrenne¹ and G. Rousset³

¹ 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: nicolas.muller@onera.fr

Abstract

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.