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On-sky demonstration of matched filters for wavefront measurements using ELT-scale elongated laser guide stars

Basden, A.G.; Bardou, L.; Bonaccini-Calia, D.; Buey, T.; Centrone, M.; Chemla, F.; Gach, J.L.; Gendron, E.; Gratadour, D.; Guidolin, I.; Jenkins, D.R.; Marchetti, E.; Morris, T.J.; Myers, R.M.; Osborn, J.; Reeves, A.P.; Reyes, M.; Rousset, G.; Stangalini, M.; Townson, M.J.; Vidal, F.

On-sky demonstration of matched filters for wavefront measurements using ELT-scale elongated laser guide stars Thumbnail


Authors

L. Bardou

D. Bonaccini-Calia

T. Buey

M. Centrone

F. Chemla

J.L. Gach

E. Gendron

D. Gratadour

I. Guidolin

D.R. Jenkins

E. Marchetti

T.J. Morris

A.P. Reeves

M. Reyes

G. Rousset

M. Stangalini

F. Vidal



Abstract

The performance of adaptive optics systems is partially dependent on the algorithms used within the real-time control system to compute wavefront slope measurements. We demonstrate the use of a matched filter algorithm for the processing of elongated laser guide star (LGS) Shack–Hartmann images, using the CANARY adaptive optics instrument on the 4.2 m William Herschel Telescope and the European Southern Observatory Wendelstein LGS Unit placed 40 m away. This algorithm has been selected for use with the forthcoming Thirty Meter Telescope, but until now had not been demonstrated on-sky. From the results of a first observing run, we show that the use of matched filtering improves our adaptive optics system performance, with increases in on-sky H-band Strehl measured up to about a factor of 1.1 with respect to a conventional centre of gravity approach. We describe the algorithm used, and the methods that we implemented to enable on-sky demonstration.

Citation

Basden, A., Bardou, L., Bonaccini-Calia, D., Buey, T., Centrone, M., Chemla, F., …Vidal, F. (2017). On-sky demonstration of matched filters for wavefront measurements using ELT-scale elongated laser guide stars. Monthly Notices of the Royal Astronomical Society, 466(4), 5003-5010. https://doi.org/10.1093/mnras/stx062

Journal Article Type Article
Acceptance Date Jan 9, 2017
Online Publication Date Jan 12, 2017
Publication Date May 1, 2017
Deposit Date Mar 13, 2017
Publicly Available Date Mar 16, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 466
Issue 4
Pages 5003-5010
DOI https://doi.org/10.1093/mnras/stx062
Related Public URLs https://arxiv.org/abs/1702.03736

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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