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Proceedings Paper

High order test bench for extreme adaptive optics system optimization
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Paper Abstract

High-contrast imagers dedicated to the search for extrasolar planets are currently being developed for the VLT (SPHERE) and Gemini (GPI) observatories. A vital part of such a high-contrast imager is the extreme adaptive optics (XAO) system that very efficiently removes effects of atmospheric turbulence and instrument aberrations. The high order test bench (HOT) implements an XAO system under realistic telescope conditions reproduced by star and turbulence generators. New technological developments (32x32 actuator micro deformable mirror, read-noise free electron multiplying CCD60, SPARTA real time computer) are used to study and compare two potential XAO wave front sensors: The Pyramid- and the Shack-Hartmann wave front sensors. We will describe the overall design of HOT including the sub-systems. We will present the closed loop study results of the behavior of the Shack-Hartmann wave front sensor in terms of linearity, sensitivity to calibration errors, performance and other specific issues.

Paper Details

Date Published: 14 July 2008
PDF: 12 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70153Z (14 July 2008); doi: 10.1117/12.788710
Show Author Affiliations
Emmanuel Aller-Carpentier, European Southern Observatory (Germany)
Markus Kasper, European Southern Observatory (Germany)
Patrice Martinez, European Southern Observatory (Germany)
Elise Vernet, European Southern Observatory (Germany)
Enrico Fedrigo, European Southern Observatory (Germany)
Christian Soenke, European Southern Observatory (Germany)
Sébastien Tordo, European Southern Observatory (Germany)
Norbert Hubin, European Southern Observatory (Germany)
Christophe Verinaud, Lab. d’Astrophysique de Grenoble (France)
Simone Esposito, INAF – Osservatorio Astrofisico di Arcetri (Italy)
Enrico Pinna, INAF – Osservatorio Astrofisico di Arcetri (Italy)
Alfio Puglisi, INAF – Osservatorio Astrofisico di Arcetri (Italy)
Andrea Tozzi, INAF – Osservatorio Astrofisico di Arcetri (Italy)
Fernando Quiros, INAF – Osservatorio Astrofisico di Arcetri (Italy)
Alastair G. Basden, Durham Univ. (United Kingdom)
Stephen J. Goodsell, Durham Univ. (United Kingdom)
Gordon D. Love, Durham Univ. (United Kingdom)
Richard M. Myers, Durham Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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