基于光学全息的任意矢量光的生成方法

Generation of arbitrary vector beam based on optical holography

基于光学全息的角度复用特性,根据空间光调制器对光场的相位和振幅调制原理,通过加载产生任意矢量光所需要的相位分布,设计了一种生成任意矢量光的方法.该方法首先利用光学全息技术记录空间光调制器加载的相位,从而制作一个全息光栅;再现过程中,两束具有相同入射角度的参考光照射全息光栅,使得两束再现光相干叠加,进而获得可调控的任意矢量光.该方法能够避免复杂偏振态的出现,并且具有生成光路简单、方便操作、生成矢量光的偏振纯度高等优势.通过计算机模拟生成了任意矢量光,获得了很好的效果.

According to the phase and amplitude modulation of the spatial light modulator （SLM） loading the phase distribu- tion for generating arbitrary vector beams, we present a method of generating arbitrary vector beams based on the optical holography with angle multiplexing. First of all, we use the optical holography to record the special phase distribution on the SLM, and so an optical holographic grating is obtained. In the reproduction process, the two conjugate reference beams with the same incident angle illuminate the holographic grating and the superposition of the two reproduced beams is achieved, thus the arbitrary vector beams are obtained. This method can avoid the emergence of complex polarization distribution, and has advantages such as simple optical setup, convenient operation, and higher polarization purity of generated arbitrary vector beams. Good results of the arbitrary vector beams are also obtained by computer simulation.