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Proceedings Paper

Performance analysis of multi-object wave-front sensing concepts for GLAO
Author(s): M. Nicolle; T. Fusco; V. Michau; G. Rousset; J.-L. Beuzit
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Paper Abstract

Adaptive optics enable large telescopes to provide diffraction limited images, but their corrected field is restrained by the angular decorrelation of the turbulent wave-fronts. However many scientific goals would benefit a wide and uniformly corrected field, even with a partial correction. Ground Layer Adaptive Optics systems are supposed to provide such a correction by compensating the lower part of the atmosphere only. Indeed this layer is in the same time highly turbulent and isoplanatic on a rather wide field. In such a system the wave-front analysis is a critical issue. Measuring the ground layer turbulence requires multi-object wave-front analysis. Two multi-object wave-front sensing concepts have been proposed so far, derived from multi conjugate adaptive optics. They are the star oriented and the layer oriented approaches. A criterion for the analytical study of both concepts performance had been proposed in a previous presentation. First results on the behavior one can expect from one concept or the other had been given then. Here is presented a study made by improving the analytical model and completing its results with the ones of a numerical model which accounts for AO limitations that are uneasy to insert in an analytical formalism. Results are presented that highlight the advantages and drawbacks of each wave-front sensing concepts and the interest of optimizing them.

Paper Details

Date Published: 25 August 2005
PDF: 12 pages
Proc. SPIE 5903, Astronomical Adaptive Optics Systems and Applications II, 59030T (25 August 2005); doi: 10.1117/12.616610
Show Author Affiliations
M. Nicolle, Office National d'Estudes et de Recherches Aerospatiales (France)
T. Fusco, Office National d'Estudes et de Recherches Aerospatiales (France)
V. Michau, Office National d'Estudes et de Recherches Aerospatiales (France)
G. Rousset, Office National d'Estudes et de Recherches Aerospatiales (France)
J.-L. Beuzit, Observatoire de Grenoble (France)

Published in SPIE Proceedings Vol. 5903:
Astronomical Adaptive Optics Systems and Applications II
Robert K. Tyson; Michael Lloyd-Hart, Editor(s)

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