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

Basden, A. G. and Bardou, L. and Bonaccini-Calia, D. and Buey, T. and Centrone, M. and Chemla, F. and Gach, J. L. and Gendron, E. and Gratadour, D. and Guidolin, I. and Jenkins, D. R. and Marchetti, E. and Morris, T. J. and Myers, R. M. and Osborn, J. and Reeves, A. P. and Reyes, M. and Rousset, G. and Stangalini, M. and Townson, M. J. and 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). pp. 5003-5010.


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.

Item Type:Article
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Publisher 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.
Date accepted:09 January 2017
Date deposited:16 March 2017
Date of first online publication:12 January 2017
Date first made open access:16 March 2017

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