相对论涡旋高次谐波的产生与调控理论研究  

Theoretical investigation of relativistic vortex high-order harmonicsgeneration and manipulation

作　　者：王剑 吴家鑫 谢端 蔡达锋 李东霞 Wang Jian;Wu Jiaxin;Xie Duan;Cai Dafeng;Li Dongxia(College of Physics and Electronic Information Engineering,Neijiang Normal College,Neijiang 641000,China;School of Electronic Information and Electrical Engineering,Changsha University,Changsha 410003,China;School of Mechanical Engineering,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]内江师范学院物理与电子信息工程学院,四川内江641000 [2]长沙学院电子信息与电气工程学院,长沙410003 [3]桂林电子科技大学电子工程与自动化学院,广西桂林541004

出　　处：《强激光与粒子束》2023年第5期15-21,共7页High Power Laser and Particle Beams

基　　金：湖南省教育厅科学研究项目重点项目(20A042);国家大学生创新创业计划项目(X2020012)。

摘　　要：目前,具有螺旋相位波前和环状光强分布的涡旋光束已在光学领域获得了广泛应用,其产生与调控自然成了研究的热点。利用三维粒子模拟程序对双色拉盖尔高斯激光驱动固体等离子激发同时携带自旋角动量与轨道角动量的高次谐波的物理过程进行了研究,根据高次谐波产生过程中的光子能量与角动量守恒定律对其内在物理机制进行了理论分析,并讨论了对谐波阶次、偏振态(自旋角动量)以及拓扑荷数(轨道角动量)进行调控的方法。研究结果为开发高亮度、超短超快、短波长、自旋与轨道角动量可调控的涡旋光束辐射源提供了理论依据,在光学微操控、超分辨成像、光通信以及离子加速等领域具有较大的实际应用前景。Vortex beams with ultra-high brilliance can greatly enrich the light and matter interaction process andeven shed light on the unexpected information in relativistic nonlinear optics.Thus,we propose a scheme forrelativistic intense vortex harmonic radiation by use of bi-circular Laguerre-Gaussian lasers irradiating relativisticplasmas.According to the law of conservation of photon energy and angular momentum during the generation ofhigher-order harmonics,the emitted harmonics own controllable spin and orbital angular momentum simultaneously,as the three-dimensional particle-in-cell simulation results shown.Based on this discussion,the methods of adjustingharmonic order,polarization state(spin angular momentum)and topological charge number(orbital angularmomentum)are proposed.It is found that if frequency ratio and circular polarization state of the bi-chromaticLaguerre-Gaussian laser are changed,such as with the same right-handed or left-handed circular polarization.Theharmonic characteristics,including the harmonic order,the polarization state and the vortex order are flexiblycontrolled.Therefore,this work provides an efficient and practical approach to produce bright,spectral tunableharmonic radiation with designable spin and orbital angular momentum,which may own the application prospectgoing from optical communications,bio-photonics,optical micromanipulations to ion accelerations.

关 键 词：涡旋光束 拉盖尔高斯激光 自旋角动量 轨道角动量 高次谐波 

分 类 号：O539[理学—等离子体物理]