A V-Folded Digital Laser for On-Demand Vortex Beams by Astigmatic Transformation of Hermite–Gaussian Modes  

作　　者：Sen-Sen Liu Xu-Dong Chen Ji-Xiong Pu Zhi-Li Lin Zi-Yang Chen 刘森森;陈旭东;蒲继雄;林志立;陈子阳(Fujian Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering,Huaqiao University)

机构地区：[1]Fujian Key Laboratory of Light Propagation and Transformation,College of Information Science and Engineering,Huaqiao University,Xiamen 361021

出　　处：《Chinese Physics Letters》2019年第12期32-35,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 61605049 and 61575070;the Natural Science Foundation of Fujian Province of China under Grant No 2018J01003;the Fundamental Research Funds for the Central Universities under Grant No ZQN-707;the Subsidized Project for Postgraduates’ Innovative Fund in Scientific Research of Huaqiao University

摘　　要：A V-folded digital laser using a spatial light modulator(SLM)for intra-cavity loss shaping is exploited to generate Hermite-Gaussian modes with on-demand mode order.With aπ/2 astigmatic mode converter,vortex beams carrying on-demand orbital angular momentum(OAM)with a tunable range from-11h to 12 h are obtained.The mode order of the HG mode,hence the OAM of the vortex beam,is digitally switched by changing the phase pattern imposed on the SLM without requiring any mechanic alignment of the cavity.This work has great potential applications in various OAM-tunable vortex beams.A V-folded digital laser using a spatial light modulator(SLM) for intra-cavity loss shaping is exploited to generate Hermite–Gaussian modes with on-demand mode order. With a π/2 astigmatic mode converter, vortex beams carrying on-demand orbital angular momentum(OAM) with a tunable range from -11h to 12 h are obtained.The mode order of the HG mode, hence the OAM of the vortex beam, is digitally switched by changing the phase pattern imposed on the SLM without requiring any mechanic alignment of the cavity. This work has great potential applications in various OAM-tunable vortex beams.

关 键 词：tunable MODULATOR SWITCHED 

分 类 号：TN9[电子电信—信息与通信工程]