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Proceedings Paper

Pre-shipment test of the ARGOS laser guide star wavefront sensor
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Paper Abstract

We present the results of the laboratory characterization of the ARGOS LGS wavefront sensor (LGSW) and dichroic units. ARGOS is the laser guide star adaptive optics system of the Large Binocular Telescope (LBT). It implements a Ground Layer Adaptive Optics (GLAO) correction for LUCI, an infrared imager and multi-object spectrograph (MOS), using 3 pulsed Rayleigh beacons focused at 12km altitude. The LGSW is a Shack-Hartman sensor having 15 × 15 subaspertures over the telescope pupil. Each LGS is independently stabilized for on-sky jitter and gated to reduce spot elongation. The 3 LGS pupils are stabilized to compensate mechanical flexure and are arranged on a single detector. Two units of LGSW have been produced and tested at Arcetri Observatory. We report on the results obtained in the pre-shipment laboratory test: internal active flexure compensation loop performance, optomechanical stability under different gravity conditions, thermal cycling, Pockels cells performance. We also update on the upcoming installation and commissioning campaign at LBT.

Paper Details

Date Published: 13 August 2014
PDF: 10 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91485G (13 August 2014); doi: 10.1117/12.2056596
Show Author Affiliations
Marco Bonaglia, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Lorenzo Busoni, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Tommaso Mazzoni, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Alfio Puglisi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Jacopo Antichi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Gilles Orban de Xivry, Max-Planck-Institut für extraterrestrische Physik (Germany)
Sebastian Rabien, Max-Planck-Institut für extraterrestrische Physik (Germany)


Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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