应用液晶空间光调制器加载螺旋相位片的方法可以高效地生成涡旋光束, 但由于液晶空间光调制器分辨率有限, 在加载高阶螺旋相位片时其中心会出现相位失真, 造成涡旋光束质量不高。通过在螺线相位片中心区域引入闪耀光栅的方法, 得到了光束质量较高的高阶单模涡旋光束和多模涡旋光束, 为生成高阶涡旋光束提供了一种很好的方法。
涡旋光束 轨道角动量 空间光调制器 闪耀光栅 vortex beams orbit angular momentum spatial light modulator blazed grating
Author Affiliations
Abstract
1 School of Opto-Electronics, Beijing Institute of Technology, Beijing 100081, China
2 School of Physics, Beijing Institute of Technology, Beijing 100081, China
A phase-diffractive optical element is designed to measure the topological charge of optical vortices. We use the scalar diffraction theory to calculate the far-field diffraction patterns. The simulation results show that almost all of the power of the incident beams is diffracted to the same diffraction order, and this approach is also effective for multi-ring optical vortices. We upload this phase-diffractive optical element on the liquid crystal spatial light modulator to do the experiment. The observed far-field diffraction patterns fit well with the simulation results.
050.4865 Optical vortices 050.1960 Diffraction theory 050.1950 Diffraction gratings Chinese Optics Letters
2016, 14(8): 080501
