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Proceedings Paper • Open Access

Large Binocular Telescope Adaptive Optics System: new achievements and perspectives in adaptive optics

Paper Abstract

The Large Binocular Telescope (LBT) is a unique telescope featuring two co-mounted optical trains with 8.4m primary mirrors. The telescope Adaptive Optics (AO) system uses two innovative key components, namely an adaptive secondary mirror with 672 actuators and a high-order pyramid wave-front sensor. During the on-sky commissioning such a system reached performances never achieved before on large ground-based optical telescopes. Images with 40mas resolution and Strehl Ratios higher than 80% have been acquired in H band (1.6 μm). Such images showed a contrast as high as 10-4. Based on these results, we compare the performances offered by a Natural Guide Star (NGS) system upgraded with the state-of-the-art technology and those delivered by existing Laser Guide Star (LGS) systems. The comparison, in terms of sky coverage and performances, suggests rethinking the current role ascribed to NGS and LGS in the next generation of AO systems for the 8-10 meter class telescopes and Extremely Large Telescopes (ELTs).

Paper Details

Date Published: 16 September 2011
PDF: 10 pages
Proc. SPIE 8149, Astronomical Adaptive Optics Systems and Applications IV, 814902 (16 September 2011); doi: 10.1117/12.898641
Show Author Affiliations
S. Esposito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
A. Riccardi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
E. Pinna, INAF - Osservatorio Astrofisico di Arcetri (Italy)
A. Puglisi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
F. Quirós-Pacheco, INAF - Osservatorio Astrofisico di Arcetri (Italy)
C. Arcidiacono, INAF - Osservatorio Astrofisico di Arcetri (Italy)
M. Xompero, INAF - Osservatorio Astrofisico di Arcetri (Italy)
R. Briguglio, INAF - Osservatorio Astrofisico di Arcetri (Italy)
G. Agapito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
L. Busoni, INAF - Osservatorio Astrofisico di Arcetri (Italy)
L. Fini, INAF - Osservatorio Astrofisico di Arcetri (Italy)
J. Argomedo, INAF - Osservatorio Astrofisico di Arcetri (Italy)
A. Gherardi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
G. Brusa, Large Binocular Telescope Observatory, The Univ. of Arizona (United States)
D. Miller, Large Binocular Telescope Observatory, The Univ. of Arizona (United States)
J. C. Guerra, Large Binocular Telescope Observatory, The Univ. of Arizona (United States)
P. Stefanini, INAF - Osservatorio Astrofisico di Arcetri (Italy)
P. Salinari, INAF - Osservatorio Astrofisico di Arcetri (Italy)


Published in SPIE Proceedings Vol. 8149:
Astronomical Adaptive Optics Systems and Applications IV
Robert K. Tyson; Michael Hart, Editor(s)

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