<title>Bispectral analysis of intensity fluctuations of optical waves propagation in turbulent atmosphere</title>

Abstract

The theoretical research of possibilities of the bispectral analysis of intensity fluctuations of the optical wave propagation in turbulent atmosphere is studied. The propagation of a plane optical wave in an approximation of a model of a thin phase screen in the turbulence with the pure Kolmogorov spectrum of fluctuations of a dielectric permittivity of atmosphere is considered. Cases of weak and strong intensity fluctuations of an optical wave asymptotically were studied. Is shown, that the bispectrum of intensity fluctuations of the plane wave propagation in turbulent atmosphere, in area of weak fluctuations is equal to zero, and in area of strong fluctuations has a two-scale character. The high frequency asymptotic of bispectrum for area of strong intensity fluctuations of an optical wave has a description of a bell-shaped surface with a characteristic scale determined to a size of speckle. The characteristic frequency of this asymptotic of spectrum is determined by the radius of a coherence of a plane wave in an atmospheric turbulence and the transversal to direction of propagation component velocities of a wind on a path of propagation. In the same conditions the low-frequency asymptotic of bispectrum is determined to a by second of scale, related with a diffraction on a radius of a coherence of a plane wave in turbulent atmosphere.