水平大气信道对圆偏振光偏振特性的影响

基于Mie散射理论利用偏振相关的Monte Carlo仿真方法对圆偏振光在水平大气中传输进行建模仿真。仿真结果表明:在大气能见度为5 km、传输距离为11.16 km条件下,接收光斑中心处保偏性能很好,且优于接收光斑边缘处保偏性能。进行了11.16 km水平大气链路左旋圆偏振光退偏实验,实验结果表明:在大气能见度为5~10 km,大气折射率结构常数Cn2=1.82510-13 m-2/3条件下,左旋圆偏振光经过长距离水平大气信道传输后偏振旋向不发生改变;接收光斑中心处保偏性能良好,优于接收光斑边缘处,和仿真结果趋势一致。

Horizontal atmospheric layer influence on polarization properties of circularly polarized laser beam

On the basis of Mie scattering theory, simulation of circularly polarized laser beam propagating in horizontal atmosphere is designed using Monte Carlo method with the consideration of polarization character. The simulations reveal that the polarization performance at the receiving spot center is fine and better than at the edges as atmospheric visibility is 5 km and transmission distance is 11.16 km. The depolarization characteristics of left-handed circularly polarized laser beam propagating in horizontal atmosphere at the distance of 11.16 km were measured. As a result, under the conditions of atmospheric visibility is 5-10 km and Cn2 is 1.825-13 m-2/3, the rotation of left-handed circularly polarized laser beam doesn't change and the polarization performance at the receiving spot center is better than at the edges. The experiment result has the same trend as simulation result.