Kolmogorov and nonstationary spectra of optical turbulence.

Optical turbulence, which develops in the transverse directions when a laser beam propagates through a medium, is considered in the framework of the two-dimensional Schrodinger equation with a weak cubic nonlinearity. This classical model of optical turbulence was studied by many authors, but stationary (Kolmogorov) spectra that transfer transverse energy of the waves from large spatial scales to small ones have not been found until now. Such spectra are given below. Non-stationary optical turbulence which evolution results in formation of a Kolmogorov spectrum is described as well. In addition to this, evolution of free optical turbulence is considered.