Studying linear polarization of laser light when propagating through tissue

Maria Olofsson, MSci
University of Linkoping, Sweden
Thesis, 2006.

In the field of laser therapy the properties of laser light interaction with skin and underlying tissue have been an issue for discussion and debate. In this thesis, the changes of polarization are surveyed when laser light passes through different types of in vitro tissues. The tissues used in the experiments are chicken skin, porcaine adipose tissue and porcaine muscle tissue. The lasers used are GaAlAs laser, manufactured to emit light at 780, 808 and 980 nm.

Common for the light emitted from all three laser diodes was a high degree of linear polarization. This degree increased when the light passed through the tissue samples. When irradiating muscle tissue, the change of polarization, both in direction and in magnitude, varied due to the alignment of the muscle fibres. The same effect, but not to the same extent, could be seen when irradiating skin tissue.

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