1. First on-sky results of the CAWS wavefront sensor on the CANARY experiment
- Author
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Tristan Buey, Lisa Bardou, Clément Schotte, M. Cohen, Nicolas Dubost, Lazar Staykov, Nazim Ali Bharmal, James Osborn, Eric Gendron, Magali Loupias, Fanny Chemla, Michel Tallon, Maud Langlois, Tim Morris, Centre for Advanced Instrumentation, Durham University (CfA), Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laura Schreiber, Dirk Schmidt, Elise Vernet, Schreiber, Laura, Schmidt, Dirk, Vernet, Elise, University of St Andrews. School of Physics and Astronomy, Durham University, École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
- Subjects
[PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] ,TK ,NDAS ,01 natural sciences ,Point-diffraction interferometry ,TK Electrical engineering. Electronics Nuclear engineering ,law.invention ,adaptive optics ,010309 optics ,Telescope ,Point diffraction interferometer ,Optics ,law ,0103 physical sciences ,Astronomical interferometer ,Electrical and Electronic Engineering ,Adaptive optics ,010303 astronomy & astrophysics ,Wavefront sensing ,QC ,Wavefront ,Physics ,business.industry ,Applied Mathematics ,Astrophysics::Instrumentation and Methods for Astrophysics ,Wavefront sensor ,Condensed Matter Physics ,Computer Science Applications ,Electronic, Optical and Magnetic Materials ,Interferometry ,Cophasing ,QC Physics ,wavefront sensing ,business - Abstract
Funding: Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) (72160371); UK Research and Innovation Science and Technology Facilities Council (STFC) (ST/L002213/1, ST/L00075X/1, ST/P000541/1, ST/T000244/1). Point-diffraction interferometers are a class of wavefront sensors which can directly measure the phase with great accuracy, regardless of defects such as vortices and disconnected apertures. Due to these properties, they have been suggested in applications such as cophasing of telescope segments, wavefront sensing impervious to the island effect and high-contrast AO and imaging. This paper presents an implementation of this class of interferometer, the Calibration & Alignment~WFS (CAWS), and the results of the first on-sky tests in the visible behind the SCAO loop of the CANARY AO experiment at the William Herschel Telescope. An initial analysis of AO residuals is performed in order to retrieve the SNR of interference fringes and assess the instrument's performance under various observing conditions. Finally, these results are used to test the validity of our models, which would allow for rapid implementation-specific modelling to find minimum-useful flux and other CAWS limits. Publisher PDF
- Published
- 2020
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