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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 11 — Jun. 3, 2013
  • pp: 13032–13039

Coherence theory of a laser beam passing through a moving diffuser

Gaoming Li, Yishen Qiu, and Hui Li  »View Author Affiliations


Optics Express, Vol. 21, Issue 11, pp. 13032-13039 (2013)
http://dx.doi.org/10.1364/OE.21.013032


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Abstract

Abstract: We present the general coherence theory for laser beams passing through a moving diffuser. The temporal coherence of laser beams passing through a moving diffuser depends on two characteristic temporal scales: the laser coherence time and the mean time it takes the diffuser to move past a phase correlation area. In most applications, the former is much shorter than the latter. Our theoretical analysis shows the spatial coherence area of light scattered from a moving diffuser decreases while the coherence time remains unchanged. The conclusion has been confirmed by experiments using a Michelson interferometer and it is not in accordance with the original coherence theory in which both the temporal and spatial coherence of light scattered by a moving diffuser decrease. We also developed a method based on the theory of eigenvalues to calculate the speckle contrast on a screen illuminated by light transmitted through a moving diffuser.

© 2013 OSA

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(030.6140) Coherence and statistical optics : Speckle
(140.3295) Lasers and laser optics : Laser beam characterization

ToC Category:
Coherence and Statistical Optics

History
Original Manuscript: March 27, 2013
Revised Manuscript: May 7, 2013
Manuscript Accepted: May 14, 2013
Published: May 20, 2013

Citation
Gaoming Li, Yishen Qiu, and Hui Li, "Coherence theory of a laser beam passing through a moving diffuser," Opt. Express 21, 13032-13039 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-11-13032


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References

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