Geometry influence on polychromatic speckle contrast

Lioudmila Tchvialeva; Tim K. Lee; Igor Markhvida; David I. McLean M.D.; Harvey Lui M.D.; Haishan Zeng

doi:10.1117/12.695470

15 September 2006 Geometry influence on polychromatic speckle contrast

Lioudmila Tchvialeva, Tim K. Lee, Igor Markhvida, David I. McLean M.D., Harvey Lui M.D., Haishan Zeng

Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 63411V (2006) https://doi.org/10.1117/12.695470
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France

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.

Citation Download Citation

Lioudmila Tchvialeva, Tim K. Lee, Igor Markhvida, David I. McLean M.D., Harvey Lui M.D., and Haishan Zeng "Geometry influence on polychromatic speckle contrast", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63411V (15 September 2006); https://doi.org/10.1117/12.695470

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