部分相干涡旋光束叠加场中的合成相干涡旋及其动态传输

Composite coherence vortices in the superimposed field of partially coherent vortex beams and their propagation dynamics

对由两束平行、离轴部分相干平顶涡旋光束叠加形成的合成相干涡旋做了详细研究.结果表明:合成相干涡旋的数目和位置与光束阶数、相对离轴距离、相干参数以及相对传输距离有关.在部分相干范畴内"隐藏"的合成相干涡旋对应于完全相干范畴中的合成光涡旋.并且证明在相干极限下合成相干涡旋就演化为合成光涡旋.

The composite coherence vortices formed by superimposing two parallel,off-axis partially coherent flattened vortex beams are studied in detail.It is shown that the number and position of composite coherence vortices depend on the beam order,relative off-axis distance and coherence parameter,as well as on the free-space relative propagation distance.The ＂hidden＂ composite coherence vortex in the partial coherence regime corresponds to its counterpart——the composite optical vortex in the full coherence regime.In the coherent limit the composite coherence vortex evolves into the composite optical vortex.