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Proceedings Paper

Large binocular telescope interferometer adaptive optics: on-sky performance and lessons learned
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Paper Abstract

The Large Binocular Telescope Interferometer is a high contrast imager and interferometer that sits at the combined bent Gregorian focus of the LBT’s dual 8.4 m apertures. The interferometric science drivers dictate 0.1” resolution with 103 − 104 contrast at 10 μm, while the 4 μm imaging science drivers require even greater contrasts, but at scales <0.2”. In imaging mode, LBTI’s Adaptive Optics system is already delivering 4 μm contrast of 104 − 105 at 0.3" − 0.75" in good conditions. Even in poor seeing, it can deliver up to 90% Strehl Ratio at this wavelength. However, the performance could be further improved by mitigating Non-Common Path Aberrations. Any NCPA remedy must be feasible using only the current hardware: the science camera, the wavefront sensor, and the adaptive secondary mirror. In preliminary testing, we have implemented an “eye doctor” grid search approach for astigmatism and trefoil, achieving 5% improvement in Strehl Ratio at 4 μm, with future plans to test at shorter wavelengths and with more modes. We find evidence of NCPA variability on short timescales and discuss possible upgrades to ameliorate time-variable effects.

Paper Details

Date Published: 21 July 2014
PDF: 11 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 914803 (21 July 2014); doi: 10.1117/12.2057138
Show Author Affiliations
Vanessa P. Bailey, Steward Observatory, The Univ. of Arizona (United States)
Philip M. Hinz, Steward Observatory, The Univ. of Arizona (United States)
Alfio T. Puglisi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Vidhya Vaitheeswaran, Steward Observatory, The Univ. of Arizona (United States)
Andrew J. Skemer, Steward Observatory, The Univ. of Arizona (United States)
Denis Defrère, Steward Observatory, The Univ. of Arizona (United States)
Amali Vaz, Steward Observatory, The Univ. of Arizona (United States)
Jarron M. Leisenring, Steward Observatory, The Univ. of Arizona (United States)


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

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