Focal-plane-assisted pyramid wavefront sensor: Enabling frame-by-frame optical gain tracking

Type Article
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
Source Astronomy & Astrophysics (0004-6361) (EDP Sciences), 2021-05 , Vol. 649 , P. A70 (7p.)
DOI 10.1051/0004-6361/202140354
Note Section Astronomical instrumentation
Keyword(s) instrumentation: adaptive optics, telescopes

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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Publisher's official version 7 8 MB Open access
Preprint - 10.1051/0004-6361/202140354 8 2 MB Open access
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