Nonlinear generation of vector beams by using a compact nonlinear fork grating  

作　　者：QIAN YANG YANGFEIFEI YANG HAO LI HAIGANG LIU XIANFENG CHEN 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [2]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

出　　处：《Photonics Research》2024年第5期1036-1043,共8页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(12004245,12192252,12374314);National Key Research and Development Program of China(2023YFA1407200)。

摘　　要：Vectorial beams have attracted great interest due to their broad applications in optical micromanipulation,optical imaging,optical micromachining,and optical communication.Nonlinear frequency conversion is an effective technique to expand the frequency range of the vectorial beams.However,the scheme of existing methods to generate vector beams of the second harmonic(SH)lacks compactness in the experiment.Here,we introduce a new way to realize the generation of vector beams of SH by using a nonlinear fork grating to solve such a problem.We examine the properties of generated SH vector beams by using Stokes parameters,which agree well with theoretical predictions.Then we demonstrate that linearly polarized vector beams with arbitrary topological charge can be achieved by adjusting the optical axis direction of the half-wave plate(HWP).Finally,we measure the nonlinear conversion efficiency of such a method.The proposed method provides a new way to generate vector beams of SH by using a microstructure of nonlinear crystal,which may also be applied in other nonlinear processes and promote all-optical waveband applications of such vector beams.

关 键 词：METHOD NONLINEAR NONLINEAR 

分 类 号：O43[机械工程—光学工程]