离轴双涡旋的单光束在非局域介质中的传输特性  

Propagation Properties of Off-Axis Double Vortex Single Beam in Nonlocal Media

作　　者：陈荣泉[1] 王清 Chen Rongquan;Wang Qing(College of Civil Engineering,Minnan University of Science and Technology,Quanzhou,Fujian 362700,China;College of Science,Jiujiang University,Jiujiang,Jiangxi 332005,China)

机构地区：[1]闽南理工学院土木工程学院,福建泉州362700 [2]九江学院理学院,江西九江332005

出　　处：《激光与光电子学进展》2021年第21期265-272,共8页Laser & Optoelectronics Progress

基　　金：福建省教育厅中青年教师教育科研项目(JAT190893)。

摘　　要：在非线性介质中,离轴偏移涡旋光束的演化规律服从非局域、非线性薛定谔方程,通过解析法可以得到初始光强和轨道角动量的表达式。采用分步傅里叶法数值模拟离轴涡旋位置、拓扑电荷和涡旋环流方向等因素对光束的临界功率、光束宽度、轨道角动量、相结构分布和传输方向的影响。结果表明,选择适当的离轴涡旋位置和拓扑电荷,双涡旋的单光束可以实现双涡结构的光强分布,也可以倾斜传输。轨道角动量的大小不仅取决于传统的拓扑电荷,也取决于离轴涡旋位置。因此,此类双涡旋单光束的可控传播在光束的信息携带和传导中具有重要的理论指导意义和应用前景。In nonlinear media,the evolution of off-axis offset vortex beams obeys the non-local and nonlinear Schrodinger equation.The expressions of initial light intensity and orbital angular momentum can be obtained by analytical methods.The split-step Fourier method is used to numerically simulate the influence of factors,such as offaxis vortex position,topological charge,and vortex circulation direction on the critical power,beam width,orbital angular momentum,phase structure distribution,and transmission direction of the beam.The results show that by selecting the appropriate off-axis vortex position and topological charge,the single beam of the double vortex can achieve the light intensity distribution of the double vortex structure,and it can also transmit obliquely.The magnitude of the orbital angular momentum depends not only on the traditional topological charge,but also on the position of the off-axis vortex.Therefore,the controllable propagation of this type of double vortex single beam has important theoretical guiding significance and application prospects in the information carrying and transmission of the beam.

关 键 词：非线性光学 非局域介质 双涡旋 拓扑电荷 轨道角动量 

分 类 号：O437[机械工程—光学工程]