中空双曲正弦高斯光束在光折变介质中的传输特性  

Propagation properties of hollow sinh-Gaussian beams in photorefractive media

作　　者：张存 王渊博 郑欣欣 苏艳丽[1] 姜其畅[1,2] ZHANG Cun;WANG Yuanbo;ZHENG Xinxin;SU Yanli;JIANG Qichang(Department of Physics and Electronic Engineering,Yuncheng University,Yuncheng 044000,China;Laboratory of Optoelectronic Information Science and Technology of Shanxi Province,Yuncheng 044000,China)

机构地区：[1]运城学院物理与电子工程系,山西运城044000 [2]山西省光电信息科学与技术实验室,山西运城044000

出　　处：《光学技术》2023年第4期459-462,共4页Optical Technique

基　　金：山西省自然基金项目(201801D121023)。

摘　　要：采用有限差分方法,从理论上分析了中空双曲正弦高斯光束在光折变介质中的传输特性。首先给出了不同光束阶数下中空双曲正弦高斯光束的强度包络,随着光束阶数的增加,光束的中空区域逐渐加大;然后分析了光束阶数和非线性参数对光束传输形态的影响。当光束阶数取2时,在一定传输距离内,中空双曲正弦高斯光束的聚焦行为具有周期性,相应的聚焦强度比逐次减弱;随着非线性参数的增加,光束首次呈现聚焦行为的传输距离逐渐减小,而聚焦强度比变大。当光束阶数改变为3时,中空光束在一定传输距离内只呈现一次聚焦行为,随后光束呈现点状分布;光束阶数改变为5时,中空光束呈现聚焦行为的传输距离进一步增加,聚焦强度比明显变大。结果表明,利用光束阶数和非线性参数可以灵活的操控中空双曲正弦高斯光束的演化形态。Based on the photorefractive media,the propagation properties of hollow sinh-Gaussian beams are investigated by using the finite difference method.The intensity envelopes of hollow sinh-Gaussian beams with different beam orders are obtained,and the hollow region becomes larger as the increasing of beam orders.The influence of beam orders and nonlinear parameters on the propagation pattern of beams is analyzed.When the beam order is 2,the hollow sinh-Gaussian beam presents the periodic focus-behavior and the focusing intensity ratio gradually becomes weaker within a certain transmission distance.With the increasing of nonlinear parameters,the first focusing distance decreases gradually,but the focusing intensity ratio increases.When the beam order is 3,the focus-behavior of beams presents only once and the beam shows spotty pattern.When the beam order is 5,the first focusing distance and the focusing intensity ratio increase further.All the results show that the propagation properties of hollow sinh-Gaussian beams can be controlled flexibly by adjusting beam orders and nonlinear parameters.

关 键 词：非线性光学 光场调控 中空双曲正弦高斯光束 周期性聚焦 

分 类 号：O437.5[机械工程—光学工程]