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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 33, Iss. 10 — May. 15, 2008
  • pp: 1159–1161

Constrained matched filtering for extended dynamic range and improved noise rejection for Shack–Hartmann wavefront sensing

L. Gilles and B. L. Ellerbroek  »View Author Affiliations


Optics Letters, Vol. 33, Issue 10, pp. 1159-1161 (2008)
http://dx.doi.org/10.1364/OL.33.001159


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Abstract

We recently introduced matched filtering in the context of astronomical Shack–Hartmann wavefront sensing with elongated sodium laser beacons [ Appl. Opt. 45, 6568 (2006) ]. Detailed wave optics Monte Carlo simulations implementing this technique for the Thirty Meter Telescope dual conjugate adaptive optics system have, however, revealed frequent bursts of degraded closed loop residual wavefront error [ Proc. SPIE 6272, 627236 (2006) ]. The origin of this problem is shown to be related to laser guide star jitter on the sky that kicks the filter out of its linear dynamic range, which leads to bursts of nonlinearities that are reconstructed into higher-order wavefront aberrations, particularly coma and trifoil for radially elongated subaperture spots. An elegant reformulation of the algorithm is proposed to extend its dynamic range using a set of linear constraints while preserving its improved noise rejection and Monte Carlo performance results are reported that confirm the benefits of the method.

© 2008 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

ToC Category:
Atmospheric and oceanic optics

History
Original Manuscript: February 5, 2008
Revised Manuscript: April 2, 2008
Manuscript Accepted: April 3, 2008
Published: May 14, 2008

Citation
L. Gilles and B. L. Ellerbroek, "Constrained matched filtering for extended dynamic range and improved noise rejection for Shack-Hartmann wavefront sensing," Opt. Lett. 33, 1159-1161 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-10-1159


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References

  1. L. Gilles and B. L. Ellerbroek, Appl. Opt. 45, 6568 (2006). [CrossRef] [PubMed]
  2. G. Herriot, R. Conan, O. Lardière, D. Andersen, B. Ellerbroek, L. Gilles, P. Hickson, K. Jackson, J. P. Véran, and L. Wang, “Compensation of TMT laser wavefront sensors for variations of sodium layer,” Proc. SPIE (to be published).
  3. L. Gilles, B. L. Ellerbroek, and J. P. Véran, Proc. SPIE 6272, 627236 (2006). [CrossRef]
  4. L. Gilles, Appl. Opt. 44, 993 (2005). [CrossRef] [PubMed]
  5. S. M. Adkins, O. Azucena, and J. E. Nelson, Proc. SPIE 6272, 62721E (2006). [CrossRef]

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