Coherence characterization of partially coherent flattoppedlaser beam propagating through Non-Kolmogorov atmospheric turbulence

In this research, with the help of the extended Huygens–Fresnel integral and theanalytical expression of the cross-spectral density, the coherence properties of thepartially coherent flat-topped (PCFT) beam propagating through Non-Kolmogorovatmospheric turbulence is investigated. The propagation behavior of beam width of thePCFT beam propagating through turbulent atmosphere based on the cross-spectral densitymatrix elements has been studied. The simulations of this study are done by consideringthe effects of source parameters (such as beam waist, flatness order and wavelength) andturbulent atmosphere factors (such as the power law exponent  , turbulence strength2n C ) by detail. Results indicate that, the spectral degree of coherence degrades rapidlyto a minimum value (zero at far field) with decreasing in the values of  and 0 walongside with the decreasing in the value of  .

Keywords:

Flat-topped laser beam , coherence , atmospheric turbulence , optical communication , Non-Kolmogorov