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7 February 2003 NAOS infrared wavefront sensor design and performance
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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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and Norbert N. Hubin "NAOS infrared wavefront sensor design and performance", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003);


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