Diagnostics of the topological charge of optical vortex by a phase-diffractive element  

作　　者：付时尧 王彤璐 高衍 高春清 

机构地区：[1]School of Opto-Electronics, Beijing Institute of Technology

出　　处：《Chinese Optics Letters》2016年第8期17-21,共5页中国光学快报（英文版）

基　　金：supported by the National Basic Research Program of China(973 program)under Grant Nos.2014CB340002 and 2014CB340004

摘　　要：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.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.

关 键 词：topological vortex modulator scalar incident spots camera propagate normalized grating 

分 类 号：O436.1[机械工程—光学工程] TN256[理学—光学]