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Distribution of laser radiation energy in biological absorbing media

The chosen physical models of biological media have been analyzed. Using the selected models of tissues we determined an influence of wavelength of radiation, emitted by laser, on energy distribution in medium. There was evaluated a range of applicability of linear and non-linear models of radiation interaction with a tissue, taking as a criterion a volumetric density of the absorbed power. Temperature distributions in medium, for cw and pulsed interaction of near IR laser beams, for the spatial system were given.