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Proceedings Article

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

[+] Author Affiliations
Gerard Rousset, Thierry Fusco, Pierre-Yves Madec

ONERA (France)

Francois Lacombe, Eric Gendron, Pierre Gigan

Observatoire de Paris-Meudon/LESIA (France)

Pascal Puget, Julien Charton, Philippe Feautrier, Pierre Y. Kern, Anne-Marie Lagrange, David Mouillet, Patrick Rabou, Eric Stadler

Observatoire de Grenoble/UJF (France)

Norbert N. Hubin

European Southern Observatory (Germany)

Robin Arsenault

Observatoire de Paris-Meudon/LESIA and European Southern Observatory (France)

Didier Rabaud


Gerard Zins

SHAKTIWARE/ONERA and European Southern Observatory (France)

Proc. SPIE 4839, Adaptive Optical System Technologies II, 140 (February 1, 2003); doi:10.1117/12.459332
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From Conference Volume 4839

  • Adaptive Optical System Technologies II
  • Peter L. Wizinowich; Domenico Bonaccini
  • Waikoloa, Hawai'i, USA | August 22, 2002


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 m V=17.6 and m K=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.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Gerard Rousset ; Francois Lacombe ; Pascal Puget ; Norbert N. Hubin ; Eric Gendron, et al.
"NAOS, the first AO system of the VLT: on-sky performance", Proc. SPIE 4839, Adaptive Optical System Technologies II, 140 (February 1, 2003); doi:10.1117/12.459332; http://dx.doi.org/10.1117/12.459332

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