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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 8 — Apr. 16, 2007
  • pp: 5147–5159

Iteratively weighted centroiding for Shack-Hartmann wave-front sensors

K. L. Baker and M. M. Moallem  »View Author Affiliations


Optics Express, Vol. 15, Issue 8, pp. 5147-5159 (2007)
http://dx.doi.org/10.1364/OE.15.005147


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Abstract

Several techniques have been used with Shack-Hartmann wave-front sensors to determine the local wave-front gradient across each lenslet. In this article we introduce an iterative weighted technique which is specifically targeted for open-loop applications such as aberrometers and metrology. In this article the iterative centroiding technique is compared to existing techniques such as center-of-mass with thresholding, weighted center-of-gravity, matched filter and cross-correlation. Under conditions of low signal-to-noise ratio, the iterative weighted centroiding algorithm is demonstrated to produce a lower variance in the reconstructed phase than existing techniques. The iteratively weighted algorithm was also compared in closed-loop and demonstrated to have the lowest error variance along with the weighted center-of-gravity, however, the iteratively weighted algorithm removes the bulk of the aberration in roughly half the iterations than the weighted center-of-gravity algorithm. This iterative weighted algorithm is also well suited to applications such as guiding on telescopes.

© 2007 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:
Adaptive Optics

History
Original Manuscript: December 4, 2006
Revised Manuscript: February 3, 2007
Manuscript Accepted: February 28, 2007
Published: April 12, 2007

Citation
K. L. Baker and M. M. Moallem, "Iteratively weighted centroiding for Shack- Hartmann wave-front sensors," Opt. Express 15, 5147-5159 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-8-5147


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