Effect of refractive dispersion on the trichromatic correlation of irradiances for atmospheric scintillation

Intensity correlation of a two-frequency wave at the finite-aperture detector

The measurement of the intensity of a wave propagating in a random medium results in a random signal response, the statistical properties of which are functions of the radiation wavelength and the ratio between the characteristic scale of the spatial intensity pattern and the size of the receiver aperture. In this paper, using multiscale solutions for high-frequency random propagators, we construct expressions for the integral intensity correlation measures that allow us to obtain the spectral intensity correlationcharacteristics and to analyze their variations as functions of wavelength separation and detector aperture. Numerical results are presented for a plane wave propagating in random media that are characterized by a Gaussian spectrum and by a power-law spectrum of the refractive-index fluctuations.

Two-color correlation of atmospheric scintillation

We present the results of measurements of the correlation of scintillations of two colors of light made in the turbulent atmosphere. In strong path-integrated turbulence the correlation is below that predicted by the weak-turbulence theory. A phenomological theoretical approach is used to account for saturation effects. This simple theory provides a reasonable approximation to the correlation data. Thus, we conclude that saturation effects reduce the two-color correlation of atmospheric scintillation.