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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 9 — May. 6, 2013
  • pp: 10676–10696

Mitigation of vibrations in adaptive optics by minimization of closed-loop residuals

Andres Guesalaga, Benoit Neichel, Jared O’Neal, and Dani Guzman  »View Author Affiliations


Optics Express, Vol. 21, Issue 9, pp. 10676-10696 (2013)
http://dx.doi.org/10.1364/OE.21.010676


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Abstract

We describe a new technique to reduce tip and tilt vibrations via the design of adaptive optics controllers in a frequency framework. The method synthesizes controllers by minimizing an H2 norm of the tip and tilt residuals. In this approach, open loop slopes (pseudo-open-loop) are reconstructed from on-sky data and input into off-line simulations of the adaptive optics system. The proposed procedure executes a sequence of off-line closed-loop runs with increasing controller complexity and searches for the controller that minimizes the variance of residuals. Although the method avoids any identification of the vibration and turbulence models during the controller synthesis, the actual models are indirectly constructed as a by-product of the H2 norm minimization. The technique has been implemented on and tested with two operational instruments, namely Paranal’s NACO and Gemini-South’s GeMS, showing an effective rejection of the main vibrations in the loop and also improving the overall performance of the system over varying turbulence conditions. It is shown that a superior performance is obtained when compared to the standard integrator controller.

© 2013 OSA

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(350.1260) Other areas of optics : Astronomical optics
(010.1285) Atmospheric and oceanic optics : Atmospheric correction

ToC Category:
Adaptive Optics

History
Original Manuscript: January 25, 2013
Revised Manuscript: April 15, 2013
Manuscript Accepted: April 20, 2013
Published: April 24, 2013

Citation
Andres Guesalaga, Benoit Neichel, Jared O’Neal, and Dani Guzman, "Mitigation of vibrations in adaptive optics by minimization of closed-loop residuals," Opt. Express 21, 10676-10696 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-9-10676


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