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Proceedings Paper

Geometry influence on polychromatic speckle contrast
Author(s): Lioudmila Tchvialeva; Tim K. Lee; Igor Markhvida; David I. McLean; Harvey Lui; Haishan Zeng
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Paper Abstract

Speckle contrast is widely used in various applications. In this work we develop a simple model to examine the influence of optical geometry on contrast reduction for polychromatic speckle the Fresnel diffraction zone. The model is based on the known fact that the sum of N independent speckle patterns decreases the contrast of the resultant pattern. The model shows how to construct zones in such a way that each zone creates an independent speckle. Theoretical grounds and experimental validation are presented. Practical applications of the derived formulae are discussed. The contrast reduction due to geometry is found to be significant for broad light low-coherent beams.

Paper Details

Date Published: 15 September 2006
PDF: 6 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63411V (15 September 2006); doi: 10.1117/12.695470
Show Author Affiliations
Lioudmila Tchvialeva, British Columbia Cancer Research Ctr. (Canada)
Tim K. Lee, British Columbia Cancer Research Ctr. (Canada)
Igor Markhvida, British Columbia Cancer Research Ctr. (Canada)
David I. McLean, Univ. of British Columbia and Vancouver Coastal Health Research Institute (Canada)
Harvey Lui, Univ. of British Columbia and Vancouver Coastal Health Research Institute (Canada)
Haishan Zeng, British Columbia Cancer Research Ctr. (Canada)


Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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