Studied cylindrical refraction of the laser beam in a diffusion layer formed at the interface between two fluids with different physical and optical characteristics. The algorithm for calculating the beam path in the transition layer stratified fluid . Obtained by computer simulation and three-dimensional image within the refractive layer, and after coming out of the cell. Visualize changing patterns refractograms influenced by the beam parameters and mode of installation . Based on the results of the optimal conditions for the experiment .