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Proceedings Paper

NAOS--the first AO system of the VLT: on-sky performance
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Paper Abstract

NAOS is the first adaptive optics system installed at the VLT 8m telescopes. It was designed, manufactured and tested by a french Consortium under an ESO contract, to provide compensated images to the high angular resolution IR spectro-imaging camera (CONICA) in the 1 to 5 μm spectral range. It is equipped with a 185 actuator deformable mirror, a tip/tilt mirror and two wavefront sensors, one in the visible and one in the near IR spectral range. It has been installed in November at the Nasmyth focus B of the VLT UT4. During the first light run in December 2001, NAOS has delivered a Strehl ratio of 50 under average seeing conditions for bright guide stars. The diffraction limit of the telescope has been achieved at 2.2 μm. The closed loop operation has been very robust under bad seeing conditions. It was also possible to obtain a substantial correction with mV=17.6 and mK=13.1 reference stars. The on-sky acceptance tests of NAOS-CONICA were completed in May 2002 and the instrument will be made available to the European astronomical community in October by ESO. This paper describes the system and present the on-sky performance in terms of Strehl ratio, seeing conditions and guide star magnitude.

Paper Details

Date Published: 7 February 2003
PDF: 10 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.459332
Show Author Affiliations
Gerard Rousset, ONERA (France)
Francois Lacombe, Observatoire de Paris-Meudon/LESIA (France)
Pascal Puget, Observatoire de Grenoble/UJF (France)
Norbert N. Hubin, European Southern Observatory (Germany)
Eric Gendron, Observatoire de Paris-Meudon/LESIA (France)
Thierry Fusco, ONERA (France)
Robin Arsenault, Observatoire de Paris-Meudon/LESIA and European Southern Observatory (France)
Julien Charton, Observatoire de Grenoble/UJF (France)
Philippe Feautrier, Observatoire de Grenoble/UJF (France)
Pierre Gigan, Observatoire de Paris-Meudon/LESIA (France)
Pierre Y. Kern, Observatoire de Grenoble/UJF (France)
Anne-Marie Lagrange, Observatoire de Grenoble/UJF (France)
Pierre-Yves Madec, ONERA (France)
David Mouillet, Observatoire de Grenoble/UJF (France)
Didier Rabaud, ONERA and SHAKTIWARE/ONERA (France)
Patrick Rabou, Observatoire de Grenoble/UJF (France)
Eric Stadler, Observatoire de Grenoble/UJF (France)
Gerard Zins, SHAKTIWARE/ONERA and European Southern Observatory (France)


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

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