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Laser guide star Shack-Hartmann wavefront sensor modeling: matched filtering, wavefront sensor nonlinearity, and impact of sodium layer variability for the Thirty Meter Telescope

Gilles, Luc and Ellerbroek, Brent (2006) Laser guide star Shack-Hartmann wavefront sensor modeling: matched filtering, wavefront sensor nonlinearity, and impact of sodium layer variability for the Thirty Meter Telescope. In: Advances in Adaptive Optics II. Proceedings of SPIE. No.6272. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 62721A. ISBN 9780819463371. http://resolver.caltech.edu/CaltechAUTHORS:20190712-111415463

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Abstract

This paper describes modeling and simulation results for the Thirty Meter Telescope on the degradation of sodium laser guide star Shack-Hartmann wavefront sensor measurement accuracy that will occur due to the spatial structure and temporal variations of the mesospheric sodium layer. Using a contiguous set of LIDAR measurements of the sodium profile, the performance of a standard centroid and of a more refined noise-optimal matched filter spot position estimation algorithm is analyzed and compared for a nominal mean signal level equal to 1000 photo-detected electrons per subaperture per integration time, as a function of subaperture to laser launch telescope distance and CCD pixel read out noise. Both algorithms are compared in terms of their rms spot position estimation error due to noise, their associated wavefront error when implemented on the Thirty Meter Telescope facility adaptive optics system, their linear dynamic range and their bias when detuned from the current sodium profile.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.671486DOIArticle
Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). Authors acknowledge the Purple Crow Lidar team from the University of Western Ontaria, Canada, for making their sodium layer measurements available to us. Glen Herriot and Jean-Pierre Véran from Herzberg Institute of Astronomy, Canada, are also acknowledged for fruitful discussions. The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the Association of Universities for Research in Astronomy (AURA), the California Institute of Technology and the University of California. This work was supported, as well, by the Canada Foundation for Innovation, the Gordon and Betty Moore Foundation, the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation, the Ontario Ministry of Research and Innovation, and the National Research Council of Canada.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
CaltechUNSPECIFIED
University of CaliforniaUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
National Optical Astronomy Observatory (NOAO)UNSPECIFIED
NSFUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Subject Keywords:Sodium laser guide star elongation, wavefront sensing, dynamic range, nonlinearity
Record Number:CaltechAUTHORS:20190712-111415463
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190712-111415463
Official Citation:Luc Gilles and Brent Ellerbroek "Laser guide star Shack-Hartmann wavefront sensor modeling: matched filtering, wavefront sensor nonlinearity, and impact of sodium layer variability for the Thirty Meter Telescope", Proc. SPIE 6272, Advances in Adaptive Optics II, 62721A (28 June 2006); https://doi.org/10.1117/12.671486
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97094
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Jul 2019 18:31
Last Modified:12 Jul 2019 18:31

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