高斯型非均匀部分相干光的大气湍流传输特性

Propagation of Gaussian Non-uniformly Partially Coherent Beams in Turbulence Atmosphere

基于广义惠更斯-菲涅耳原理和交叉谱密度函数,对高斯型非均匀关联的部分相干光束在大气湍流中的传输特性进行了研究.结果表明,部分相干光的相干度的变化和源平面的高斯调制半宽、传输距离等有着密切关系.在传输过程中,初始平面相干度分布存在突变,在传输过程中消失;光束中两点的相干度随着传输距离的增加先增大后减小,并且相干度的分布由非均匀分布变成均匀分布.这种非均匀关联的部分相干光束在激光通信领域具有广阔的应用前景.

Based on the extended Huygens-Fresnel principle and the unique cross spectrum density,the propagation properties of Gaussian non-uniformly partially coherent beams in turbulence atmosphere are studied synthetically.The results show that the abrupt change of the coherence distribution in the source plane disappear during the propagation in the turbulence atmosphere.During the propagation,the degree of coherence between two points first increase and then decrease with the increase of propagation distance.What＆#39;s more,the non-uniform distribution of coherence in the source plane turns into uniform.Nonuniformly correlated partially coherent beams may have some applications in optical communication.