叠加态涡旋光束经旋转随机粗糙表面的频移特性  

The Characteristics of Frequency Shift of Superposition Vortex Beams Passing through a Rotating Random Rough Surface

作　　者：吕宏[1] 党磊 贺蕊 Lv Hong;DANG Lei;HE Rui(School of Optoelectronic Engineering,Xi’an Technological University,Xi’an,Shaanxi 710021,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021

出　　处：《电子学报》2021年第10期1969-1974,共6页Acta Electronica Sinica

基　　金：陕西省自然科学基础研究计划项目资助(No.2019JM-470);陕西省教育厅科研计划资助(No.18JS048)。

摘　　要：论文基于涡旋光束传输特性及光散射理论,研究了叠加态涡旋光束经旋转随机粗糙表面的场分布及干涉特性.对拓扑荷值大小相同、符号相反的两束涡旋光进行了叠加生成仿真及实验,利用角谱衍射理论,分析了旋转随机粗糙表面均方根粗糙度对光束传输的影响,数值计算了不同拓扑荷值的叠加态涡旋光束经旋转随机粗糙表面后,与参考光进行干涉得到不同转速下归一化强度值随时间变化的曲线,并通过光强-时间函数间接求得频移量,再反演得到旋转目标的转速.结果表明:通过仿真曲线的周期反演频率,当转速Ω分别为2π/3 rad/s,2πrad/s,10π/3 rad/s时,对应的频移Δf分别为2/3Hz,2Hz,10/3Hz.研究结果可以为叠加涡旋光的调控及应用提供理论参考.Based on the transmission characteristics of vortex beams and light scattering theory,the field distribution and interference characteristics of superposition vortex beams passing through the rotating random rough surface are studied.Two vortex beams with the same topological charge value and opposite signs are used for simulation and experiment of superimposition generation.Using angular spectrum diffraction theory,the influence of the root-mean-square roughness of the rotating random rough surface on the beam transmission is analyzed.As the superposition vortex beams with different topological charges pass through the rotating random rough surface and interfere with the reference light,the time-dependent curve of normalized intensity values at different rotational speeds can be obtained through numerical calculation.Then the frequency shift can be indirectly obtained by light intensity-time function and the speed of rotating target can be obtained through inversion.The results show that:the frequency is inverted by the period of the simulation curve,and when the rotational speedΩis 2π/3 rad/s,2πrad/s,10π/3 rad/s,the corresponding frequency shiftΔf is 2/3Hz,2Hz,10/3Hz,respectively.The results of this research can provide a theoretical reference for the regulation and application of superposition vortex beams.

关 键 词：叠加态涡旋光束 旋转随机粗糙表面 频移 场分布 干涉 

分 类 号：TN929.1[电子电信—通信与信息系统]