The main physical processes occurring during the interaction of optical radiation with matter.- The methods for describing the interaction of laser radiation with biological tissues and objects.- Present situation of studies in biological objects by means of mathematical models describing the interaction of biological tissue with laser light.-The mathematical modeling of electrical characteristics of spherical particles, simulating blood cells by the method of intracavity laser spectroscopy.- Construction of mathematical models of laser interaction with turbid media, for example, human skin.- The electrodynamics model of a plane wave reflection from the layer-modeling biological structure with slowly varying thickness, taking into account the roughness.- The light scattering by dielectric bodies of arbitrary shape with application to problems of biomedical optics.- The Simulation of electrophysical properties of biological tissues by the intracavity laser spectroscopy method.- Analysis of the effect of small-scale inhomogeneities on the electrophysical characteristics of a thin layer by intracavity laser spectroscopy.- Simulation of the thermal processes induced by action of laser radiation on organic media.