Average spreading and directionality of broadband partially coherent beam in non-Kolmogorov turbulence

Abstract

The average spreading and directionality of broadband partially coherent beam (BPCB) in non-Kolmogorov turbulence is studied. The effects of exponent value α, propagation distance, spectrum width, inner and outer scale parameters is studied in detail. Numerical calculation reveals that the beam width increases with the increasing in spectrum bandwidth just like when propagating in Kolmogorov turbulence, however, the beam width may vary as much as by a factor of 50% with different α. The difference in beam width between monochromatic partially coherent beam (MPCB) and BPCB at the receiving plane may vary from 2% to 10% with different α. The angular spreading is more sensitive to α than the spectrum bandwidth; also it is more sensitive to the inner scale parameters than the outer scale parameter.