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: This email address is being protected from spambots. You need JavaScript enabled to view it.

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.