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Constrained matched filtering for extended dynamic range and improved noise rejection for Shack-Hartmann wavefront sensing

Gilles, L. and Ellerbroek, B. L. (2008) Constrained matched filtering for extended dynamic range and improved noise rejection for Shack-Hartmann wavefront sensing. Optics Letters, 33 (10). pp. 1159-1161. ISSN 0146-9592. gilhttps://resolver.caltech.edu/CaltechAUTHORS:GILol08

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Abstract

We recently introduced matched filtering in the context of astronomical Shack-Hartmann wavefront sensing with elongated sodium laser beacons [Appl. Opt. 45, 6568 (2006)]. Detailed wave optics Monte Carlo simulations implementing this technique for the Thirty Meter Telescope dual conjugate adaptive optics system have, however, revealed frequent bursts of degraded closed loop residual wavefront error [Proc. SPIE 6272, 627236 (2006)]. The origin of this problem is shown to be related to laser guide star jitter on the sky that kicks the filter out of its linear dynamic range, which leads to bursts of nonlinearities that are reconstructed into higher-order wavefront aberrations, particularly coma and trifoil for radially elongated subaperture spots. An elegant reformulation of the algorithm is proposed to extend its dynamic range using a set of linear constraints while preserving its improved noise rejection and Monte Carlo performance results are reported that confirm the benefits of the method.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1364/OL.33.001159PublisherUNSPECIFIED
http://www.opticsinfobase.org/abstract.cfm?URI=ol-33-10-1159PublisherUNSPECIFIED
Additional Information:© 2008 Optical Society of America. Received February 5, 2008; revised April 2, 2008; accepted April 3, 2008; posted April 17, 2008 (Doc. ID 92515); published May 14, 2008. The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology, and the University of California. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA), and the U.S. National Science Foundation.
Funders:
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
California Institute of TechnologyUNSPECIFIED
University of CaliforniaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Natural Sciences and Engineering Research Council of CanadaUNSPECIFIED
British Columbia Knowledge Development FundUNSPECIFIED
Association of Universities in Astronomy (AURA)UNSPECIFIED
National Science FoundationUNSPECIFIED
Subject Keywords:Adaptive optics; Wave-front sensing
Issue or Number:10
Record Number:CaltechAUTHORS:GILol08
Persistent URL:gilhttps://resolver.caltech.edu/CaltechAUTHORS:GILol08
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11118
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:15 Jul 2008 22:51
Last Modified:03 Oct 2019 00:16

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