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Journal of Astronomical Telescopes, Instruments, and Systems

Speckle statistics in adaptive optics images at visible wavelengths
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Paper Abstract

Residual speckles in adaptive optics (AO) images represent a well-known limitation on the achievement of the contrast needed for faint source detection. Speckles in AO imagery can be the result of either residual atmospheric aberrations, not corrected by the AO, or slowly evolving aberrations induced by the optical system. We take advantage of the high temporal cadence (1 ms) of the data acquired by the System for Coronagraphy with High-order Adaptive Optics from R to K bands-VIS forerunner experiment at the Large Binocular Telescope to characterize the AO residual speckles at visible wavelengths. An accurate knowledge of the speckle pattern and its dynamics is of paramount importance for the application of methods aimed at their mitigation. By means of both an automatic identification software and information theory, we study the main statistical properties of AO residuals and their dynamics. We therefore provide a speckle characterization that can be incorporated into numerical simulations to increase their realism and to optimize the performances of both real-time and postprocessing techniques aimed at the reduction of the speckle noise.

Paper Details

Date Published: 25 April 2017
PDF: 7 pages
J. Astron. Telesc. Instrum. Syst. 3(2) 025001 doi: 10.1117/1.JATIS.3.2.025001
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 3, Issue 2
Show Author Affiliations
Marco Stangalini, INAF - Osservatorio Astronomico di Roma (Italy)
ADONI Adaptive Optics National Lab. of Italy (Italy)
Fernando Pedichini, INAF - Osservatorio Astronomico di Roma (Italy)
ADONI Adaptive Optics National Lab. of Italy (Italy)
Enrico Pinna, ADONI Adaptive Optics National Lab. of Italy (Italy)
INAF - Osservatorio Astrofisico di Arcetri (Italy)
Julian C. Christou, Univ. of Arizona (United States)
John Hill, Univ. of Arizona (United States)
Alfio Puglisi, ADONI Adaptive Optics National Lab. of Italy (Italy)
INAF - Osservatorio Astrofisico di Arcetri (Italy)
Vanessa P Bailey, Stanford Univ. (United States)
Mauro Centrone, INAF - Osservatorio Astronomico di Roma (Italy)
Dario Del Moro, Univ. degli Studi di Roma "Tor Vergata" (Italy)
Simone Esposito, ADONI Adaptive Optics National Lab. of Italy (Italy)
INAF - Osservatorio Astrofisico di Arcetri (Italy)
Fabrizio Fiore, INAF - Osservatorio Astronomico di Roma (Italy)
ADONI Adaptive Optics National Lab. of Italy (Italy)
Emanuele Giallongo, INAF - Osservatorio Astronomico di Roma (Italy)
ADONI Adaptive Optics National Lab. of Italy (Italy)
Phil Hinz, The Univ. of Arizona (United States)
Amali Vaz, The Univ. of Arizona (United States)


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