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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 4 — Feb. 14, 2011
  • pp: 3694–3702

Speckle contrast in near field scattering limited by time coherence

Gaoming Li, Yishen Qiu, Hui Li, Yan Huang, Shou Liu, and Zhiyun Huang  »View Author Affiliations

Optics Express, Vol. 19, Issue 4, pp. 3694-3702 (2011)

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The relationship between the speckle contrast of scattered light in near field and longitudinal distance that is perpendicular to scattering surface is investigated. The experiment indicates that when using the laser illumination source with proper time coherence length, the curve of speckle contrast vs. longitudinal distance appears minimum turning point. The position and value of minimum point are decided by the coherence of light and scattering matter. It is easy to obtain the correlation area of scattered light by measuring the minimum point position and the illuminated area. Comparing to traditional scattering technique, this method can simultaneously measure the roughness parameters of surface height variance and surface height correlation area.

© 2011 OSA

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(290.5820) Scattering : Scattering measurements
(180.4243) Microscopy : Near-field microscopy

ToC Category:
Coherence and Statistical Optics

Original Manuscript: December 21, 2010
Revised Manuscript: February 4, 2011
Manuscript Accepted: February 4, 2011
Published: February 10, 2011

Virtual Issues
Vol. 6, Iss. 3 Virtual Journal for Biomedical Optics

Gaoming Li, Yishen Qiu, Hui Li, Yan Huang, Shou Liu, and Zhiyun Huang, "Speckle contrast in near field scattering limited by time coherence," Opt. Express 19, 3694-3702 (2011)

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