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Proceedings Paper

Image quality and high contrast improvements on VLT/NACO
Author(s): Julien H. V. Girard; Jared O'Neal; Dimitri Mawet; Markus Kasper; Gérard Zins; Benoît Neichel; Johann Kolb; Valentin Christiaens; Martin Tourneboeuf
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Paper Abstract

NACO is the famous and versatile diffraction limited NIR imager and spectrograph at the VLT with which ESO celebrated 10 years of Adaptive Optics. Since two years a substantial effort has been put in understanding and fixing issues that directly affect the image quality and the high contrast performances of the instrument. Experiments to compensate the non-common-path aberrations and recover the highest possible Strehl ratios have been carried out successfully and a plan is hereafter described to perform such measurements regularly. The drift associated to pupil tracking since 2007 was fixed in october 2011. NACO is therefore even more suited for high contrast imaging and can be used with coronagraphic masks in the image plane. Some contrast measurements are shown and discussed. The work accomplished on NACO will serve as reference for the next generation instruments on the VLT, especially the ones working at the diffraction limit and making use of angular differential imaging (i.e. SPHERE, VISIR, and possibly ERIS).

Paper Details

Date Published: 13 September 2012
PDF: 14 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84470L (13 September 2012); doi: 10.1117/12.925660
Show Author Affiliations
Julien H. V. Girard, European Southern Observatory (Chile)
Jared O'Neal, European Southern Observatory (Chile)
Dimitri Mawet, European Southern Observatory (Chile)
Markus Kasper, European Southern Observatory (Germany)
Gérard Zins, IPAG, Univ. Joseph Fourier, CNRS (France)
Benoît Neichel, Gemini Observatory (Chile)
Johann Kolb, European Southern Observatory (Germany)
Valentin Christiaens, Univ. de Liège (Belgium)
European Southern Observatory (Chile)
Martin Tourneboeuf, Univ. Católica de Chile (Chile)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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