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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: A182–A200

Generalized aliasing and its implications in modal gain optimization for multi-conjugate adaptive optics

Fernando Quirós-Pacheco, Jean-Marc Conan, and Cyril Petit  »View Author Affiliations


JOSA A, Vol. 27, Issue 11, pp. A182-A200 (2010)
http://dx.doi.org/10.1364/JOSAA.27.00A182


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Abstract

The error of generalized aliasing associated with the limited sampling of the atmospheric turbulence volume due to the finite number of wavefront sensing directions in wide-field-of-view adaptive optics is formally defined. Following a modal approach, we extend the direct problem formulation of star-oriented multi-conjugate adaptive optics (MCAO) to model and quantify this error analytically. We show that the turbulence estimation with the least-squares reconstructor is subject to strong generalized aliasing, in particular affecting the badly seen modes, whereas with the minimum-mean-square-error reconstructor the estimation is little affected. Finally, we show that the application of modal gain optimization techniques in closed-loop MCAO systems is jeopardized by the generalized aliasing error.

© 2010 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(100.3190) Image processing : Inverse problems

History
Original Manuscript: April 9, 2010
Revised Manuscript: August 19, 2010
Manuscript Accepted: August 22, 2010
Published: September 22, 2010

Citation
Fernando Quirós-Pacheco, Jean-Marc Conan, and Cyril Petit, "Generalized aliasing and its implications in modal gain optimization for multi-conjugate adaptive optics," J. Opt. Soc. Am. A 27, A182-A200 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-11-A182

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