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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 27, Iss. 11 — Nov. 1, 2010
  • pp: A9–A18

Performance comparison of wavefront reconstruction and control algorithms for Extremely Large Telescopes

I. Montilla, C. Béchet, M. Le Louarn, M. Reyes, and M. Tallon  »View Author Affiliations


JOSA A, Vol. 27, Issue 11, pp. A9-A18 (2010)
http://dx.doi.org/10.1364/JOSAA.27.0000A9


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Abstract

Extremely Large Telescopes (ELTs) are very challenging with respect to their adaptive optics (AO) requirements. Their diameters and the specifications required by the astronomical science for which they are being designed imply a huge increment in the number of degrees of freedom in the deformable mirrors. Faster algorithms are needed to implement the real-time reconstruction and control in AO at the required speed. We present the results of a study of the AO correction performance of three different algorithms applied to the case of a 42 - m ELT: one considered as a reference, the matrix-vector multiply (MVM) algorithm; and two considered fast, the fractal iterative method (FrIM) and the Fourier transform reconstructor (FTR). The MVM and the FrIM both provide a maximum a posteriori estimation, while the FTR provides a least-squares one. The algorithms are tested on the European Southern Observatory (ESO) end-to-end simulator, OCTOPUS. The performance is compared using a natural guide star single-conjugate adaptive optics configuration. The results demonstrate that the methods have similar performance in a large variety of simulated conditions. However, with respect to system misregistrations, the fast algorithms demonstrate an interesting robustness.

© 2010 Optical Society of America

OCIS Codes
(350.1260) Other areas of optics : Astronomical optics
(110.1080) Imaging systems : Active or adaptive optics

History
Original Manuscript: January 15, 2010
Revised Manuscript: April 22, 2010
Manuscript Accepted: May 27, 2010
Published: June 21, 2010

Citation
I. Montilla, C. Béchet, M. Le Louarn, M. Reyes, and M. Tallon, "Performance comparison of wavefront reconstruction and control algorithms for Extremely Large Telescopes," J. Opt. Soc. Am. A 27, A9-A18 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-11-A9


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