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Proceedings Paper

A dual interpretation of experimental data concerning the propagation of laser light through tissue-like turbid media
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Paper Abstract

The propagation is investigated of a continuous laser beam through homogeneous tissue-like turbid media such as diluted emulsions of Intralipid or milk having presumably sharply forward directed Henyey-Greenstein or Gaussian indicatrices. The cross sectional radial distributions of the detected forward-propagating light power at different depths along the beam axis in each medium of interest are experimentally determined. The detected-power spatial distribution, for both the types of indicatrices, is also described analytically by a solution of the radiative transfer equation in the so-called small-angle approximation. The experimental results are consistent with the analytical expressions obtained that are shown to allow one to estimate the extinction ( αt), reduced-scattering (αrs) and absorption (αa) coefficients and the gfactor of the investigated media. The values obtained of α quite reasonable and behave, depending on the dilution turbidity, in a way observed formerly in other similar experiments. The comparative analysis of the estimated characteristics of the dilutions shows that in the case of Henyey-Greenstein indicatrix we have a smaller value of the g-factor and larger value of αrs with respect to the case of Gaussian indicatrix. At equal g-factors, in the former case we shall have a narrower forward-propagating scattered-light beam with higher on-axis intensity as compared with the latter case.

Paper Details

Date Published: 17 January 2011
PDF: 9 pages
Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 774710 (17 January 2011); doi: 10.1117/12.881697
Show Author Affiliations
I. Bliznakova, Institute of Electronics (Bulgaria)
L. Gurdev, Institute of Electronics (Bulgaria)
T. Dreischuh, Institute of Electronics (Bulgaria)
O. Vankov, Institute of Electronics (Bulgaria)
D. Stoyanov, Institute of Electronics (Bulgaria)
L. Avramov, Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 7747:
16th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Dimitar Slavov, Editor(s)

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