title: Improvement of Shack-Hartmann wave-front sensor measurement for extreme adaptive optics.
abstract: The development of high-performance adaptive optics systems requires the optimization of wave-front sensors (WFSs) working in the high-order correction regime. We propose a new method to improve the wave-front slope estimation of a Shack-Hartmann WFS in such a regime. Based on a detailed analysis of the different errors in the slope estimation with a classical centroid and with the new method, the gain in terms of wave-front-sensing accuracy in both the detector and the photon noise regimes is stressed. This improvement is proposed without major system disruption.
authors.affiliation: Département d'Optique Théorique et Appliquée--Office National d'Etudes de Recherche Aérospatiale, 29 Avenue de la Division Leclerc, 92322 Châtillon Cedex, France. magali.nicolle@onera.fr
authors.forename: M
authors.initials: M
authors.lastname: Nicolle
authors.forename: T
authors.initials: T
authors.lastname: Fusco
authors.forename: G
authors.initials: G
authors.lastname: Rousset
authors.forename: V
authors.initials: V
authors.lastname: Michau