Optics and Photonics Society of Iran

In this research, with the help of the extended Huygens–Fresnel integral and theunified theory of coherence and polarization, the propagation behavior of the partially coherent flat-topped (PCFT) beam propagating through Non-Kolmogorov atmospheric turbulence is investigated. Kolmogorov turbulence spectrum model is widely used to predict the degradation of the optical wave propagation. Turbulence spectrum deviates from the Kolmogorov turbulence in some cases and the non-Kolmogorov turbulent spectrum is characterized by the power law exponent. Researchers introduced the non-Kolmogorov model because the Kolmogorov model is sometimes incomplete for depicting atmospheric turbulence.

The propagation behavior of beam width and the spectral degree of coherence of the PCFT beam propagating through turbulent atmosphere based on the cross-spectral density matrix elements has been studied. The simulations of this study are done by considering the effects of source parameters and turbulent atmosphere factors by detail. Results indicate that, the spectral degree of coherence degrades rapidly to a minimum value (zero at far field) with decreasing in the values of wavelength and the power law exponent.