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Proceedings Paper

First light AO (FLAO) system for LBT: final integration, acceptance test in Europe, and preliminary on-sky commissioning results
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Paper Abstract

In this paper we present the laboratory characterization and performance evaluation of the First Light Adaptive Optics (FLAO) the Natural Guide Star adaptive optics system for the Large Binocular Telescope (LBT). The system uses an adaptive secondary mirror with 672 actuators and a pyramid wavefront sensor with adjustable sampling of the telescope pupil from 30×30 down to 4×4 subapertures. The system was fully assembled in the Arcetri Observatory laboratories, passing the acceptance test in December 2009. The performance measured during the test were closed to goal specifications for all star magnitudes. In particular FLAO obtained 83% Strehl Ratio (SR) in the bright end (8.5 magnitudes star in R band) using H band filter and correcting 495 modes with 30×30 subapertures sampling. In the faint end (16.4 magnitude) a 5.0% SR correcting 36 modes with 7×7 subapertures was measured. The seeing conditions for these tests were 0.8" (r0 = 0.14m @ 550 nm) and an average wind speed of 15m/s. The results at other seeing conditions up to 1.5" are also presented. The system has been shipped to the LBT site, and the commissioning is taking place since March to December 2010. A few on sky results are presented.

Paper Details

Date Published: 15 July 2010
PDF: 12 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 773609 (15 July 2010); doi: 10.1117/12.858194
Show Author Affiliations
Simone Esposito, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Armando Riccardi, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Luca Fini, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Alfio T. Puglisi, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Enrico Pinna, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Marco Xompero, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Runa Briguglio, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Fernando Quirós-Pacheco, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Paolo Stefanini, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Juan C. Guerra, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Lorenzo Busoni, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Andrea Tozzi, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Francesca Pieralli, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Guido Agapito, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Guido Brusa-Zappellini, Large Binocular Telescope Observatory (United States)
Richard Demers, Large Binocular Telescope Observatory (United States)
Joar Brynnel, Large Binocular Telescope Observatory (United States)
Carmelo Arcidiacono, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Piero Salinari, INAF-Osservatorio Astrofisico di Arcetri (Italy)


Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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