Beam wander of focused electromagnetic multi-Gaussian Schell-model beams propagation in anisotropic turbulence

摘要

Analytical expression of the cross-spectral density matrix of the focused electromagnetic MGSM beams propagation through in non-Kolmogorov anisotropic turbulent atmosphere is obtained. With the help of this formulation, the influences of non-Kolmogorov anisotropic turbulence and source parameters on beam spreading and beam wander of focused electromagnetic Multi-Gaussian Shell-model (MGSM) beams in the atmosphere are discussed. Increasing the anisotropic property of atmospheric turbulence could degrade both beam spreading and beam wander. The values of the turbulence structure parameter, inner scale and propagation distance had significant effects on the beam wander of focused electromagnetic MGSM beams, where a peak phenomenon of the beam wander existed as they increased. Electromagnetic MGSM beams with larger beam order, beam width, wavelength could better mitigate the turbulence effects than GSM beams, which could be adopted as a better light source with several adjustable parameters to lower scintillation and beam wander in free-space optical communication.