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Characterization of ALPAO deformable mirrors for the NAOMI VLTI Auxiliary Telescopes adaptive optics
Author(s): Jean-Baptiste Le Bouquin; Jean-Philippe Berger; Jean-Luc Beuzit; Eric Cottalorda; Alain Delboulbe; Sebastien E. Egner; Frederic Yves Joseph Gonte; Sylvain Guieu; Pierre Haguenauer; Laurent Jocou; Yves Magnard; Thibaut Moulin; Sylvain Rochat; Christophe Verinaud; Julien Woillez
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Paper Abstract

The Very Large Telescope Interferometer Auxiliary Telescopes will soon be equipped with an adaptive optics system called NAOMI. The corrective optics deformable mirror is the commercial DM241 from ALPAO. Being part of an interferometer operating from visible to mid-infrared, the DMs of NAOMI face several challenges (high level of reliability, open-loop chopping, piston-free control, WFS/DM pupil rotation, high desired bandwidth and stroke). We here describe our extensive characterization of the DMs through measurements and simulations. We summarize the operational scenario we have defined to handle the specific mirror properties. We conclude that the ALPAO DMs have overall excellent properties that fulfill most of the stringent requirements and that deviations from specifications are easily handled. To our knowledge, NAOMI will be the first astronomical system with a command in true Zernike modes (allowing software rotation), and the first astronomical system in which a chopping is performed with the deformable mirror (5” sky, at 5 Hz).

Paper Details

Date Published: 17 July 2018
PDF: 10 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 1070371 (17 July 2018); doi: 10.1117/12.2313442
Show Author Affiliations
Jean-Baptiste Le Bouquin, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Univ. of Michigan (United States)
Jean-Philippe Berger, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Jean-Luc Beuzit, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Eric Cottalorda, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Alain Delboulbe, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Sebastien E. Egner, European Southern Observatory (Germany)
Frederic Yves Joseph Gonte, European Southern Observatory (Germany)
Sylvain Guieu, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Pierre Haguenauer, European Southern Observatory (Germany)
Laurent Jocou, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Yves Magnard, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Thibaut Moulin, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Sylvain Rochat, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Christophe Verinaud, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
European Southern Observatory (Germany)
Julien Woillez, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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