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Proceedings Paper

The adaptive secondary mirror for the Large Binocular Telescope: optical acceptance test and preliminary on-sky commissioning results
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Paper Abstract

The Large Binocular Telescope (LBT) has two adaptive secondary mirrors based on 672 voice-coil force actuators. The shape of the mirror is controlled using internal metrology based on co-located capacitive sensors. The first mirror unit is currently mounted on LBT for on-sky commissioning as part of the First Light Adaptive Optics System (FLAO). During spring-time 2009 the optical acceptance test was performed using the 14-m optical test tower at the Osservatorio Astrofisico di Arcetri (INAF) showing the capability of flattening the shell at the level of 14nm rms residual surface error. This paper reports the optical layout, calibration procedures and results of the optical acceptance test. Moreover we report the first results obtained during the early runs of FLAO commissioning showing the ability of the mirror to compensate for atmospheric turbulence with extremely high Strehl ratio values (better than 80% in H-band) as permitted by the largest number of correcting degrees of freedom currently available on-sky for astronomical telescopes.

Paper Details

Date Published: 22 July 2010
PDF: 12 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77362C (22 July 2010); doi: 10.1117/12.858229
Show Author Affiliations
Armando Riccardi, 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)
Lorenzo Busoni, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Luca Fini, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Alfio Puglisi, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Carmelo Arcidiacono, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Enrico Pinna, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Piero Ranfagni, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Piero Salinari, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Guido Brusa, Large Binocular Telescope Observatory, The Univ. of Arizona (United States)
Richard Demers, Large Binocular Telescope Observatory, The Univ. of Arizona (United States)
Roberto Biasi, Microgate s.r.l. (Italy)
Daniele Gallieni, A.D.S. International s.r.l. (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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