SPECIAL SECTION ON TISSUE POLARIMETRY

Degree of polarization in laser speckles from turbid media: Implications in tissue optics

[+] Author Affiliations
Jun Li, Gang Yao, Lihong V. Wang

Texas A&M University, Optical Imaging Laboratory, Biomedical Engineering Program, 3120 TAMU, College Station, Texas?77843-3120

J. Biomed. Opt. 7(3), 307-312 (Jul 01, 2002). doi:10.1117/1.1483313
History: Received Apr. 29, 2001; Revised Mar. 20, 2002; Accepted Mar. 29, 2002; Online August 01, 2002
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The degree of polarization (DOP) of laser-speckle fields, where the speckles were generated by a polarized laser beam incident upon two kinds of samples: ground glass and wax, was investigated within a single coherence area as well as over multiple coherence areas. For the surface-scattering ground glass, the incident polarization state was preserved in the speckle field, and hence the DOP remained at unity regardless of the area of detection. For the volume-scattering wax, the polarization states varied with positions in the field, and consequently the DOP depended on the area of detection: the DOP decreased with an increasing area of detection, and only when the area was much smaller than the coherence area would the DOP approach unity. A numerical simulation explained the experimental observation. These results are important for the understanding of polarization phenomena in turbid media such as biological tissue. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Citation

Jun Li ; Gang Yao and Lihong V. Wang
"Degree of polarization in laser speckles from turbid media: Implications in tissue optics", J. Biomed. Opt. 7(3), 307-312 (Jul 01, 2002). ; http://dx.doi.org/10.1117/1.1483313


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