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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 19 — Jul. 1, 2012
  • pp: 4520–4535

Comparison of vibration mitigation controllers for adaptive optics systems

Andres Guesalaga, Benoit Neichel, Francois Rigaut, James Osborn, and Dani Guzman  »View Author Affiliations

Applied Optics, Vol. 51, Issue 19, pp. 4520-4535 (2012)

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Vibrations are detrimental to the performance of modern adaptive optics (AO) systems. In this paper, we describe new methods tested to mitigate the vibrations encountered in some of the instruments of the Gemini South telescope. By implementing a spectral analysis of the slope measurements from several wavefront sensors and an imager, we can determine the frequencies and magnitude of these vibrations. We found a persistent vibration at 55 Hz with others occurring occasionally at 14 and 100 Hz. Two types of AO controllers were designed and implemented, Kalman and H, in the multiconjugate AO tip–tilt loop. The first results show a similar performance for these advanced controllers and a clear improvement in vibration rejection and overall performance over the classical integrator scheme. It is shown that the reduction in the standard deviation of the residual slopes (as measured by wavefront sensors) is highly dependent on turbulence, wind speed, and vibration conditions, ranging—in terms of slopes RMS value—from an almost negligible reduction for high speed wind to a factor of 5 for a combination of low wind and strong vibrations.

© 2012 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: March 1, 2012
Revised Manuscript: May 4, 2012
Manuscript Accepted: May 21, 2012
Published: June 29, 2012

Andres Guesalaga, Benoit Neichel, Francois Rigaut, James Osborn, and Dani Guzman, "Comparison of vibration mitigation controllers for adaptive optics systems," Appl. Opt. 51, 4520-4535 (2012)

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