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Optics Express

Optics Express

  • Editor: Micha
  • Vol. 13, Iss. 23 — Nov. 14, 2005
  • pp: 9527–9536

Extended object wavefront sensing based on the correlation spectrum phase

Per A. Knutsson, Mette Owner-Petersen, and Chris Dainty  »View Author Affiliations

Optics Express, Vol. 13, Issue 23, pp. 9527-9536 (2005)

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In this paper we investigate the performance of a Fourier based algorithm for fast subpixel shift determination of two mutually shifted images subjected to noise. The algorithm will be used for Shack-Hartmann based adaptive optics correction of images of an extended object subjected to dynamical atmospheric fluctuations. The performance of the algorithm is investigated both analytically and by Monte Carlo simulations. Good agreement is achieved in relation to how the precision of the shift estimate depends on image parameters such as contrast, photon counts and readout noise, as well as the dependence on sampling format, zero-padding and field of view. Compared to the conventional method for extended object wavefront sensing, a reduction of the computational cost is gained at a marginal expense of precision.

© 2005 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
(350.1260) Other areas of optics : Astronomical optics

ToC Category:
Research Papers

Original Manuscript: August 24, 2005
Revised Manuscript: November 3, 2005
Published: November 14, 2005

Per Knutsson, Mette Owner-Petersen, and Chris Dainty, "Extended object wavefront sensing based on the correlation spectrum phase," Opt. Express 13, 9527-9536 (2005)

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