The results of measurements of transmittance of high power laser irradiation through skull bones and scalp are presented. Dependences of transmittance on sample thickness were received. Character of transmittance was investigated and characteristics of heterogeneity of the scattering structure of the skull bones are proposed. Besides that, variation of temperature of skull and scalp surfaces under exposure of high power laser irradiation during experiments was controlled. Experimental results were verified by Monte-Carlo simulations.

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The speckle method of characterization of multiple scattering media by squared-pulse modulation of the probe light frequency is described. This method assumes the analysis of the decay in speckle modulation that is due to the superposition of two decorrelated blinking speckle patterns. Theoretical predictions based on the phenomenological model of formation of partially blurred speckles under the condition of frequency switching are in reasonable agreement with the corresponding experimental data.

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