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Computationally efficient wavefront reconstructor for simulation of multiconjugate adaptive optics on giant telescopes

Ellerbroek, Brent L. and Gilles, L. and Vogel, C. R. (2003) Computationally efficient wavefront reconstructor for simulation of multiconjugate adaptive optics on giant telescopes. In: Adaptive Optical System Technologies II. Proceedings of SPIE. No.4839. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 989-1000. ISBN 9780819446183.

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Multi-conjugate adaptive optical (MCAO) systems with from 10,000 to 100,000 degrees of freedom have been proposed for future giant telescopes. Using standard matrix methods to compute, optimize, and implement wavefront reconstruction algorithms for these systems is impractical, since the number of calculations required to compute (apply) the reconstruction matrix scales as the cube (square) of the number of AO degrees of freedom. Significant improvements in computational efficiency are possible by exploiting the sparse and/or periodic structure of the deformable mirror influence matrices and the atmospheric turbulence covariance matrices appearing in these calculations. In this paper, we review recent progress in developing an iterative sparse matrix implementation of minimum variance wavefront reconstruction for MCAO. The basic method is preconditioned conjugate gradients, using a multigrid preconditioner incorporating a layer-oriented, iterative smoothing operator. We outline the key elements of this approach, including special considerations for laser guide star (LGS) MCAO systems with tilt-removed LGS wavefront measurements and auxiliary full aperture tip/tilt measurements from natural guide stars. Performance predictions for sample natural guide star (NGS) and LGS MCAO systems on 8 and 16 meter class telescopes are also presented.

Item Type:Book Section
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Additional Information:© 2003 Society of Photo-optical Instrumentation Engineers (SPIE). This work was supported by the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini Partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).
Group:Thirty Meter Telescope
Funding AgencyGrant Number
Gemini ObservatoryUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Australian Research CouncilUNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)UNSPECIFIED
Subject Keywords:Adaptive optics, wavefront reconstruction, extremely large telescopes
Series Name:Proceedings of SPIE
Issue or Number:4839
Record Number:CaltechAUTHORS:20190118-110937269
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Official Citation:Brent L. Ellerbroek, Luc Gilles, Curtis R. Vogel, "Computationally efficient wavefront reconstructor for simulations of multiconjugate adaptive optics on giant telescopes," Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.459673
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92371
Deposited By: Tony Diaz
Deposited On:21 Jan 2019 23:13
Last Modified:16 Nov 2021 03:49

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