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Proceedings Paper

NAOS infrared wavefront sensor design and performance
Author(s): Eric Gendron; Francois Lacombe; Daniel Rouan; Julien Charton; Claude Collin; Bertrand Lefort; Claude Marlot; Genevieve Michet; Gerard Nicol; Sylvain Pau; V. D. Phan; Bernard Talureau; Jean-Luis Lizon; Norbert N. Hubin
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Paper Abstract

Only a very few examples of near-infrared wavefront sensors can be found in the litterature. However, none of these sensors provide routine observation yet. Our sensor is the only one to be operated routinely on a large AO system. Entirely cryogenized, this sensor is built around a so-called HAWAII array from Rockwell (HgCdTe, 1024×1024). It is working in the huge spectral band ranging from 0.8 to 2.55 microns, and may use -when required- all the flux from this very whole band. It allows to switch between several optical configurations in order to match all atmospheric and observing conditions, while its original mechanical design allows to keep, even at cryogenic temperatures, a mechanical stability lower than 4 microns in any position. It also has some particular read-out schemes, allowing to obtain frame rates as high as 1200 Hz while keeping a read-out noise performance of 10 electrons rms/pixel. The analysis of the design parameters (pixel size, field of view) is exposed in this article. Some results, obtained during the comissioning runs at ESO, will also be presented.

Paper Details

Date Published: 7 February 2003
PDF: 11 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.460025
Show Author Affiliations
Eric Gendron, Observatoire de Paris-Meudon/LESIA (France)
Francois Lacombe, Observatoire de Paris-Meudon/LESIA (France)
Daniel Rouan, Observatoire de Paris-Meudon/LESIA (France)
Julien Charton, Observatoire de Grenoble/UJF (France)
Claude Collin, Observatoire de Paris-Meudon/LESIA (France)
Bertrand Lefort, Observatoire de Paris-Meudon/LESIA (France)
Claude Marlot, Observatoire de Paris-Meudon/LESIA (France)
Genevieve Michet, Observatoire de Paris-Meudon/LESIA (France)
Gerard Nicol, Observatoire de Paris-Meudon/LESIA (France)
Sylvain Pau, Observatoire de Paris-Meudon/LESIA (France)
V. D. Phan, Observatoire de Paris-Meudon/LESIA (France)
Bernard Talureau, Observatoire de Paris-Meudon/LESIA (France)
Jean-Luis Lizon, European Southern Observatory (Germany)
Norbert N. Hubin, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 4839:
Adaptive Optical System Technologies II
Peter L. Wizinowich; Domenico Bonaccini, Editor(s)

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