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13 August 2014 Pre-shipment test of the ARGOS laser guide star wavefront sensor
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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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marco Bonaglia, Lorenzo Busoni, Tommaso Mazzoni, Alfio Puglisi, Jacopo Antichi, Simone Esposito, Gilles Orban de Xivry, and Sebastian Rabien "Pre-shipment test of the ARGOS laser guide star wavefront sensor", Proc. SPIE 9148, Adaptive Optics Systems IV, 91485G (13 August 2014); https://doi.org/10.1117/12.2056596
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