First on-sky results of the CAWS wavefront sensor on the CANARY experiment

Nicolas Dubost; Nazim Bharmal; Maud Langlois; Magali Loupias; Clément Schotte; Michel Tallon; Lazar Staykov; Lisa Bardou; James Osborn; Fanny Chemla; Matthieu Cohen; Tristan Buey; Éric Gendron; Tim Morris

doi:10.1117/12.2561326

First on-sky results of the CAWS wavefront sensor on the CANARY experiment

Nicolas Dubost^*, Nazim Bharmal, Maud Langlois, Magali Loupias, Clément Schotte, Michel Tallon, Lazar Staykov, Lisa Bardou, James Osborn, Fanny Chemla, Matthieu Cohen, Tristan Buey, Éric Gendron, Tim Morris

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

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.

Original language	English
Title of host publication	Adaptive Optics Systems VII
Editors	Laura Schreiber, Dirk Schmidt, Elise Vernet
Publisher	SPIE
Number of pages	15
ISBN (Electronic)	9781510636835
DOIs	https://doi.org/10.1117/12.2561326
Publication status	Published - 13 Dec 2020
Event	Adaptive Optics Systems VII 2020 - Virtual, Online, United States Duration: 14 Dec 2020 → 18 Dec 2020 Conference number: 11448 https://spie.org/AS/conferencedetails/adaptive-optics-in-astronomy?SSO=1

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11448
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Adaptive Optics Systems VII 2020
Country/Territory	United States
City	Virtual, Online
Period	14/12/20 → 18/12/20
Internet address	https://spie.org/AS/conferencedetails/adaptive-optics-in-astronomy?SSO=1

Keywords

Adaptive optics
Point-diffraction interferometry
Wavefront sensing

Access to Document

10.1117/12.2561326

Dubost-2021-First-on-sky-reults-AOSVII-ProcSPIE-1144819
Copyright © 2021 SPIE. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1117/12.2561326.
Final published version, 3.51 MB

Cite this

Dubost, N., Bharmal, N., Langlois, M., Loupias, M., Schotte, C., Tallon, M., Staykov, L., Bardou, L., Osborn, J., Chemla, F., Cohen, M., Buey, T., Gendron, É., & Morris, T. (2020). First on-sky results of the CAWS wavefront sensor on the CANARY experiment. In L. Schreiber, D. Schmidt, & E. Vernet (Eds.), Adaptive Optics Systems VII Article 1144819 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11448). SPIE. https://doi.org/10.1117/12.2561326

@inproceedings{9d9e0c033e944130a800defd6669e6aa,

title = "First on-sky results of the CAWS wavefront sensor on the CANARY experiment",

abstract = "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.",

keywords = "Adaptive optics, Point-diffraction interferometry, Wavefront sensing",

author = "Nicolas Dubost and Nazim Bharmal and Maud Langlois and Magali Loupias and Cl{\'e}ment Schotte and Michel Tallon and Lazar Staykov and Lisa Bardou and James Osborn and Fanny Chemla and Matthieu Cohen and Tristan Buey and {\'E}ric Gendron and Tim Morris",

note = "Funding: Comisi{\'o}n Nacional de Investigaci{\'o}n Cient{\'i}fica y Tecnol{\'o}gica (CONICYT) (72160371); UK Research and Innovation Science and Technology Facilities Council (STFC) (ST/L002213/1, ST/L00075X/1, ST/P000541/1, ST/T000244/1).; Adaptive Optics Systems VII 2020 ; Conference date: 14-12-2020 Through 18-12-2020",

year = "2020",

month = dec,

day = "13",

doi = "10.1117/12.2561326",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE",

editor = "Laura Schreiber and Dirk Schmidt and Elise Vernet",

booktitle = "Adaptive Optics Systems VII",

address = "United States",

url = "https://spie.org/AS/conferencedetails/adaptive-optics-in-astronomy?SSO=1",

}

Dubost, N, Bharmal, N, Langlois, M, Loupias, M, Schotte, C, Tallon, M, Staykov, L, Bardou, L, Osborn, J, Chemla, F, Cohen, M, Buey, T, Gendron, É & Morris, T 2020, First on-sky results of the CAWS wavefront sensor on the CANARY experiment. in L Schreiber, D Schmidt & E Vernet (eds), Adaptive Optics Systems VII., 1144819, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11448, SPIE, Adaptive Optics Systems VII 2020, Virtual, Online, United States, 14/12/20. https://doi.org/10.1117/12.2561326

First on-sky results of the CAWS wavefront sensor on the CANARY experiment. / Dubost, Nicolas; Bharmal, Nazim; Langlois, Maud et al.
Adaptive Optics Systems VII. ed. / Laura Schreiber; Dirk Schmidt; Elise Vernet. SPIE, 2020. 1144819 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11448).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - First on-sky results of the CAWS wavefront sensor on the CANARY experiment

AU - Dubost, Nicolas

AU - Bharmal, Nazim

AU - Langlois, Maud

AU - Loupias, Magali

AU - Schotte, Clément

AU - Tallon, Michel

AU - Staykov, Lazar

AU - Bardou, Lisa

AU - Osborn, James

AU - Chemla, Fanny

AU - Cohen, Matthieu

AU - Buey, Tristan

AU - Gendron, Éric

AU - Morris, Tim

N1 - Conference code: 11448

PY - 2020/12/13

Y1 - 2020/12/13

N2 - 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.

AB - 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.

KW - Adaptive optics

KW - Point-diffraction interferometry

KW - Wavefront sensing

U2 - 10.1117/12.2561326

DO - 10.1117/12.2561326

M3 - Conference contribution

AN - SCOPUS:85100060407

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Adaptive Optics Systems VII

A2 - Schreiber, Laura

A2 - Schmidt, Dirk

A2 - Vernet, Elise

PB - SPIE

T2 - Adaptive Optics Systems VII 2020

Y2 - 14 December 2020 through 18 December 2020

ER -

First on-sky results of the CAWS wavefront sensor on the CANARY experiment

Abstract

Publication series

Conference

Keywords

Access to Document

Fingerprint

Cite this