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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 30, Iss. 4 — Apr. 1, 2013
  • pp: 604–615

Increased sky coverage with optimal correction of tilt and tilt-anisoplanatism modes in laser-guide-star multiconjugate adaptive optics

Carlos Correia, Jean-Pierre Véran, Glen Herriot, Brent Ellerbroek, Lianqi Wang, and Luc Gilles  »View Author Affiliations

JOSA A, Vol. 30, Issue 4, pp. 604-615 (2013)

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Laser-guide-star multiconjugate adaptive optics (MCAO) systems require natural guide stars (NGS) to measure tilt and tilt-anisoplanatism modes. Making optimal use of the limited number of photons coming from such, generally dim, sources is mandatory to obtain reasonable sky coverage, i.e., the probability of finding asterisms amenable to NGS wavefront (WF) sensing for a predefined WF error budget. This paper presents a Strehl-optimal (minimum residual variance) spatiotemporal reconstructor merging principles of modal atmospheric tomography and optimal stochastic control theory. Simulations of NFIRAOS, the first light MCAO system for the thirty-meter telescope, using 500 typical NGS asterisms, show that the minimum-variance (MV) controller delivers outstanding results, in particular for cases with relatively dim stars (down to magnitude 22 in the H-band), for which low-temporal frame rates (as low as 16 Hz) are required to integrate enough flux. Over all the cases tested 21nm rms median improvement in WF error can be achieved with the MV compared to the current baseline, a type-II controller based on a double integrator. This means that for a given level of tolerable residual WF error, the sky coverage is increased by roughly 10%, a quite significant figure. The improvement goes up to more than 20% when compared with a traditional single-integrator controller.

© 2013 Optical Society of America

OCIS Codes
(000.5490) General : Probability theory, stochastic processes, and statistics
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(110.6960) Imaging systems : Tomography

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: December 6, 2012
Revised Manuscript: January 25, 2013
Manuscript Accepted: January 25, 2013
Published: March 11, 2013

Carlos Correia, Jean-Pierre Véran, Glen Herriot, Brent Ellerbroek, Lianqi Wang, and Luc Gilles, "Increased sky coverage with optimal correction of tilt and tilt-anisoplanatism modes in laser-guide-star multiconjugate adaptive optics," J. Opt. Soc. Am. A 30, 604-615 (2013)

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