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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 8 — Apr. 16, 2007
  • pp: 4705–4710

Feasibility of symmetry-based speckle noise reduction for faint companion detection

E. E. Bloemhof  »View Author Affiliations

Optics Express, Vol. 15, Issue 8, pp. 4705-4710 (2007)

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Great interest has been focused on the problem of detecting faint companions, possibly including extrasolar planets, very close to other stars. A promising approach involves coupling high-correction adaptive optics to coronagraphs, for which many new and innovative designs have emerged. Detection of faint companions will require suppression of noise due to fluctuating speckles from the remnant fraction of stellar light not adaptively controlled. At high correction, the speckle halo takes on distinct spatial symmetries that may allow partial speckle noise reduction through relatively simple post-processing that rejects one spatial symmetry in the image. This paper quantitatively examines potential companion-detection sensitivity improvements that might be expected, and shows that realistic operational parameters will allow them to be realized.

© 2007 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(030.6140) Coherence and statistical optics : Speckle
(350.1260) Other areas of optics : Astronomical optics

ToC Category:
Adaptive Optics

Original Manuscript: January 22, 2007
Revised Manuscript: March 13, 2007
Manuscript Accepted: March 20, 2007
Published: April 3, 2007

E. E. Bloemhof, "Feasibility of symmetry-based speckle noise reduction for faint companion detection," Opt. Express 15, 4705-4710 (2007)

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