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
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.

Full Text
File Pages Size Access
Publisher's official version 7 8 MB Open access
Preprint - 10.1051/0004-6361/202140354 8 2 MB Open access
Top of the page