Focal-plane-assisted pyramid wavefront sensor: Enabling frame-by-frame optical gain tracking
| Type | Article | ||||||||||||
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| Date | 2021-05 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Chambouleyron V.2, Fauvarque Olivier3, Sauvage J.-F., Neichel B.1, Fusco T.1 | ||||||||||||
| Affiliation(s) | 1 : Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France 2 : DOTA, ONERA, Université Paris Saclay, 91123 Palaiseau, France 3 : IFREMER, Laboratoire Detection, Capteurs et Mesures (LDCM), Centre Bretagne, ZI de la Pointe du Diable, CS 10070, 29280 Plouzane, France |
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| Source | Astronomy & Astrophysics (0004-6361) (EDP Sciences), 2021-05 , Vol. 649 , P. A70 (7p.) | ||||||||||||
| DOI | 10.1051/0004-6361/202140354 | ||||||||||||
| WOS© Times Cited | 5 | ||||||||||||
| Note | Section Astronomical instrumentation | ||||||||||||
| Keyword(s) | instrumentation: adaptive optics, telescopes | ||||||||||||
| Abstract | Aims. With its high sensitivity, the pyramid wavefront sensor (PyWFS) is becoming an advantageous sensor for astronomical adaptive optics (AO) systems. However, this sensor exhibits significant non-linear behaviours leading to challenging AO control issues. Methods. In order to mitigate these effects, we propose to use in addition to the classical pyramid sensor a focal plane image combined with a convolutive description of the sensor to fast track the PyWFS non-linearities, the so-called optical gains (OG). Results. We show that this additional focal plane imaging path only requires a small fraction of the total flux while representing a robust solution to estimating the PyWFS OG. Finally, we demonstrate the gain that our method brings with specific examples of bootstrapping and handling non-common path aberrations. |
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