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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 6 — Feb. 20, 2005
  • pp: 1003–1010

Robustness study of the pseudo open-loop controller for multiconjugate adaptive optics

Piotr Piatrou and Luc Gilles  »View Author Affiliations


Applied Optics, Vol. 44, Issue 6, pp. 1003-1010 (2005)
http://dx.doi.org/10.1364/AO.44.001003


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Abstract

Robustness of the recently proposed “pseudo open-loop control” algorithm against various system errors has been investigated for the representative example of the Gemini-South 8-m telescope multiconjugate adaptive-optics system. The existing model to represent the adaptive-optics system with pseudo open-loop control has been modified to account for misalignments, noise and calibration errors in deformable mirrors, and wave-front sensors. Comparison with the conventional least-squares control model has been done. We show with the aid of both transfer-function pole-placement analysis and Monte Carlo simulations that POLC remains remarkably stable and robust against very large levels of system errors and outperforms in this respect least-squares control. Approximate stability margins as well as performance metrics such as Strehl ratios and rms wave-front residuals averaged over a 1-arc min field of view have been computed for different types and levels of system errors to quantify the expected performance degradation.

© 2005 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.7350) Atmospheric and oceanic optics : Wave-front sensing

History
Original Manuscript: July 27, 2004
Revised Manuscript: October 8, 2004
Manuscript Accepted: October 12, 2004
Published: February 20, 2005

Citation
Piotr Piatrou and Luc Gilles, "Robustness study of the pseudo open-loop controller for multiconjugate adaptive optics," Appl. Opt. 44, 1003-1010 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-6-1003

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