Beam spreading of partially coherent beams propagating through turbulence atmospheric in boundary layer

摘要

The cross-spectral density function of the partially coherent beam on 1.06μm is extended based on the generalized Huygens-Fresnel principle by using the Gaussian Schell-mode(GSM) and the modified Frehlich spectrum. And on the analysis of variation of the beam spreading radius w with the initial emission radius w_0, zenith angle θ and propagating distance z, the intensity distribution and beam spreading of GSM beam through atmospheric boundary layer turbulence are obtained under different distance. The results show that the beam spreading can be reduced at long distance for the suitable w_0 according to the inflexion value of the curve. As well as, simulation results demonstrate that the modified Frehlich spectrum and the modified von Karman spectrum have little difference on the beam spreading for partially coherent beam propagating in atmospheric boundary layer turbulence.