A novel technique for measurements of optical properties of biological tissue samples is proposed. The scattered radiation pattern of the irradiated tissue was measured experimentally by changing the distance from the sample to the inlet of the integrating sphere. A Monte Carlo method was used for simulations of the radiation propagation in the sample. The optical properties of the aloe arborescens were determined via comparison of the simulation results to the experimentally measured angular dependence of the light power scattered and transmitted through the sample.
The concept of the equivalent temperature of the crystal interacting with laser radiation, which was recently introduced in laser physics, is based on the dependence of the crystal sample eigenfrequencies on its temperature. This concept was successfully applied for measurements of low absorption coefficients of different optical materials. In this paper, we present an accurate identification of the equivalent temperature of the sample with its thermodynamic temperature basing on both mathematical modelling and experimental verification.
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