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. (C) 2017 Society of PhotoOptical Instrumentation Engineers (SPIE).
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/625223 |
| Date | 25 April 2017 |
| Creators | Stangalini, Marco, Pedichini, Fernando, Pinna, Enrico, Christou, Julian, Hill, John, Puglisi, Alfio, Bailey, Vanessa, Centrone, Mauro, Del Moro, Dario, Esposito, Simone, Fiore, Fabrizio, Giallongo, Emanuele, Hinz, Phil, Vaz, Amali |
| Contributors | Univ Arizona, LBTO, Univ Arizona, Steward Observ, INAF-OAR, Astronomical Observatory of Rome, National Institute for Astrophysics, Monte Porzio Catone, ItalybADONI Adaptive Optics National Lab of Italy, Italy, INAF-OAR, Astronomical Observatory of Rome, National Institute for Astrophysics, Monte Porzio Catone, ItalybADONI Adaptive Optics National Lab of Italy, Italy, ADONI Adaptive Optics National Lab of Italy, ItalycINAF-Arcetri Astrophysical Observatory of Florence, National Institute for Astrophysics, Florence, Italy, University of Arizona, LBTO, Tucson, Arizona United States, University of Arizona, LBTO, Tucson, Arizona United States, ADONI Adaptive Optics National Lab of Italy, ItalycINAF-Arcetri Astrophysical Observatory of Florence, National Institute for Astrophysics, Florence, Italy, KIPAC-Stanford University, Stanford, California, United States, INAF-OAR, Astronomical Observatory of Rome, National Institute for Astrophysics, Monte Porzio Catone, Italy, Universitá di Roma Tor Vergata, Rome, Italy, ADONI Adaptive Optics National Lab of Italy, ItalycINAF-Arcetri Astrophysical Observatory of Florence, National Institute for Astrophysics, Florence, Italy, INAF-OAR, Astronomical Observatory of Rome, National Institute for Astrophysics, Monte Porzio Catone, ItalybADONI Adaptive Optics National Lab of Italy, Italy, INAF-OAR, Astronomical Observatory of Rome, National Institute for Astrophysics, Monte Porzio Catone, ItalybADONI Adaptive Optics National Lab of Italy, Italy, University of Arizona, CAAO, Steward Observatory, Tucson, Arizona, United States, University of Arizona, CAAO, Steward Observatory, Tucson, Arizona, United States |
| Publisher | SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS |
| Source Sets | University of Arizona |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | © 2017 Society of Photo-Optical Instrumentation Engineers |
| Relation | http://astronomicaltelescopes.spiedigitallibrary.org/article.aspx?doi=10.1117/1.JATIS.3.2.025001 |
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