用反射式纯相位液晶空间光调制器产生涡旋光束

Generation of vortex beams with a reflected type phase only LCSLM

利用反射式纯相位型液晶空间光调制器(LCSLM)实时动态地产生不同拓扑荷数的涡旋光束,能量转换效率高达60%。并分析了其与平面波以及球面波的干涉特性。当CCD在非成像面上时,涡旋中心出现暗核,且其直径随拓扑荷数的增加而增大。实验结果和理论分析基本一致。

In this paper,a vortex beam with different topological charges is generated by using a reflected type phase only liquid crystal spatial light modulator（LCSLM）,and the interference characteristics of a vortex beam and a plane wave and a spherical wave are analyzed.When the CCD′s location is away from the image plane,there is a dark core in the vortex center.An increment of topological charge results in increasing diameter of the dark core.Experiment and theoretical analysis are consistent.Experimental results show that using the LCSLM,vortex beams with different topological charges can be generated dynamically in real time.The energy conversion efficiency is up to 60%.