Propagation properties of stochastic electromagnetic double-vortex beams in turbulent atmosphere

Based on the extended Huygens-Fresnel principle, we study the propagation properties of stochastic electromagnetic double-vortex beams in turbulent atmosphere. The result shows that the spreading of the partially coherent double-vortex beams can be smaller than that of the fully coherent ones. The degree of polarization of this kind of beam will experience change, which is dependent on the degree of polarization of the source plane, the atmospheric turbulence, topological charge, and the spatial coherence. The results may have applications in space optical communication.     

分数阶双涡旋光束的实验研究

具有分数阶拓扑荷数的涡旋光束的产生及其传输是近几年来人们感兴趣的研究课题． 本文提出了一种新型的分数阶双涡旋光束, 该光束是由两束带有不同分数阶拓扑荷数的涡旋光束共轴叠加产生, 其光强分布为双环结构．我们对该光束分别进行了理论模拟和实验研究．研究表明, 分数阶双涡旋光束的双环携带不同的轨道角动量, 且相互独立地传输．这种新型的涡旋光束相对于整数阶或单个分数阶拓扑荷数的涡旋光束更具有控制多样性, 有望在光学镊子、光学扳手等微粒子操控领域开发新的应用．     

Propagation properties of stochastic electromagnetic double-vortex beams in a turbulent atmosphere

Based on the extended Huygens-Fresnel principle,we study the propagation properties of stochastic electromagnetic double-vortex beams in a turbulent atmosphere.The result shows that the spreading of partially coherent double-vortex beams can be smaller than that of fully coherent ones.The degree of polarization of this kind of beam will experience change,which is dependent on the degree of polarization of the source plane,the atmospheric turbulence,topological charge,and the spatial coherence.The results may have applications in space optical communication.