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Proceedings Paper

Sensitivity to differential piston and to adaptive optics errors with the Large Binocular Telescope Interferometer
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Paper Abstract

On-sky adaptive optics wavefront screens have been used and random optical path fluctuations - differential pistons - have been included in numerical simulations for the Large Binocular Telescope Interferometer. We characterize the Point Spread Function (PSF) and the Optical Transfer Function (OTF) by computing respectively the interferometric Strehl and the visibility criteria. We study the contribution of the wavefront disturbance induced by each adaptive optics system and by the optical path difference between the arms of the LBTI. To provide an image of quality (Strehl above 70%) suitable with standard science cases , the requirements for a LBTI mode in the visible wavelengths (750nm) must be at least an adaptive optics wavefront RMS fluctuations below λ/18≈40nm (Strehl above 90%) provided by each adaptive optics system, and a differential piston RMS fluctuations below λ/8≈100nm in the overall LBTI system. The adaptive optics wavefront errors - mainly the differential tip-tilt - appear to be more critical than the differential piston.

Paper Details

Date Published: 16 August 2016
PDF: 13 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99071T (16 August 2016); doi: 10.1117/12.2232086
Show Author Affiliations
Fabien Patru, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Alfio Puglisi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Armando Riccardi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Enrico Pinna, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Carmelo Arcidiacono, INAF - Osservatorio Astrofisico di Arcetri (Italy)
John Hill, Large Binocular Telescope Observatory (United States)
Philip Hinz, Large Binocular Telescope Observatory (United States)


Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

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