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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

  • Vol. 17, Iss. 8 — Aug. 1, 2000
  • pp: 1440–1453

Adaptive optics based on analog parallel stochastic optimization: analysis and experimental demonstration

Mikhail A. Vorontsov, Gary W. Carhart, Marc Cohen, and Gert Cauwenberghs  »View Author Affiliations


JOSA A, Vol. 17, Issue 8, pp. 1440-1453 (2000)
http://dx.doi.org/10.1364/JOSAA.17.001440


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Abstract

Wave-front distortion compensation using direct system performance metric optimization is studied both theoretically and experimentally. It is shown how different requirements for wave-front control can be incorporated, and how information from different wave-front sensor types can be fused, within a generalized gradient descent optimization paradigm. In our experiments a very-large-scale integration (VLSI) system implementing a simultaneous perturbation stochastic approximation optimization algorithm was applied for real-time adaptive control of multielement wave-front correctors. The custom-chip controller is used in two adaptive laser beam focusing systems, one with a 127-element liquid-crystal phase modulator and the other with beam steering and 37-control channel micromachined deformable mirrors. The submillisecond response time of the micromachined deformable mirror and the parallel nature of the analog VLSI control architecture provide for high-speed adaptive compensation of dynamical phase aberrations of a laser beam under conditions of strong intensity scintillations. Experimental results demonstrate improvement of laser beam quality at the receiver plane in the spectral band up to 60 Hz.

© 2000 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(110.0110) Imaging systems : Imaging systems

History
Original Manuscript: September 23, 1999
Revised Manuscript: March 1, 2000
Manuscript Accepted: March 1, 2000
Published: August 1, 2000

Citation
Mikhail A. Vorontsov, Gary W. Carhart, Marc Cohen, and Gert Cauwenberghs, "Adaptive optics based on analog parallel stochastic optimization: analysis and experimental demonstration," J. Opt. Soc. Am. A 17, 1440-1453 (2000)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-17-8-1440

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