Geometry influence on polychromatic speckle contrast

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.

[1]  Lioudmila Tchvialeva,et al.  Influence of geometry on polychromatic speckle contrast. , 2007, Journal of the Optical Society of America. A, Optics, image science, and vision.

[2]  A M Weiner,et al.  Characterization and imaging in optically scattering media by use of laser speckle and a variable-coherence source. , 2000, Optics letters.

[3]  J M Huntley.  Simple model for image-plane polychromatic speckle contrast. , 1999, Applied optics.

[4]  Geng Ku,et al.  Ultrasound-modulated optical tomography of biological tissue by use of contrast of laser speckles. , 2002, Applied optics.

[5]  João L. Pinto,et al.  Contrast of polychromatic speckle patterns and its dependence to surface heights distribution , 2003 .

[6]  Gareth Parry,et al.  Speckle Patterns in Partially Coherent Light , 1975 .

[7]  Atul K. Jain,et al.  Space and wavelength dependence of speckle intensity , 1974 .

[8]  Shaoqun Zeng,et al.  Efficient characterization of regional mesenteric blood flow by use of laser speckle imaging. , 2003, Applied optics.

[9]  Catherine Hun,et al.  Speckle techniques for pavement surface analysis , 2003, Speckle: International Conference on Speckle Metrology.

[10]  Alexander P Sviridov,et al.  Speckle-contrast monitoring of tissue thermal modification. , 2002, Applied optics.

[11]  J. Goodman.  Speckle Phenomena in Optics: Theory and Applications , 2020 .

[12]  H. M. Pedersen.  On the Contrast of Polychromatic Speckle Patterns and Its Dependence on Surface Roughness , 1975 .

[13]  Guillermo J. Tearney,et al.  Atherosclerotic plaque characterization by spatial and temporal speckle pattern analysis , 2001, CLEO 2001.

[14]  John J. Turek,et al.  Holographic optical coherence imaging of tumor spheroids , 2003 .

[15]  J D Briers,et al.  Capillary Blood Flow Monitoring Using Laser Speckle Contrast Analysis (LASCA). , 1999, Journal of biomedical optics.

[16]  Gang Yao,et al.  Imaging obscured subsurface inhomogeneity using laser speckle. , 2005, Optics express.