径向偏振扭曲矩形多高斯-谢尔模光束及其传输特性  

Radially Polarized Twisted Rectangular Multi-Gaussian Schell-Model Beam and Its Propagation Properties

作　　者：张瑞 刘欣格 徐华锋 Zhang Rui;Liu Xinge;Xu Huafeng(School of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan 232001,Anhui,China)

机构地区：[1]安徽理工大学力学与光电物理学院,安徽淮南232001

出　　处：《激光与光电子学进展》2022年第11期157-166,共10页Laser & Optoelectronics Progress

基　　金：安徽省自然科学基金(1808085QA10);安徽省大学生创新创业训练计划项目(S202010361207)。

摘　　要：近年来,携带扭曲相位的部分相干光束因其独特的性质受到广泛关注。引入一种同时携带扭曲相位和具有特殊空间关联结构的部分相干矢量光束,即径向偏振扭曲矩形多高斯-谢尔模光束,推导了该光束通过ABCD光学系统后的交叉光谱密度矩阵元解析表达式,并研究了它的归一化光强分布、光谱相干度和光谱偏振度的演化特性。研究结果表明,当无扭曲相位时,径向偏振矩形多高斯-谢尔模光束的光强由源平面的空心圆环轮廓逐渐演变成矩形平顶轮廓。相较而言,径向偏振扭曲矩形多高斯-谢尔模光束所携带的扭曲相位不仅会引起光束光斑的旋转,还会引起传播过程中光束的相干度和偏振度的一系列变化。该研究结果为扭曲相位实现新型矢量结构光束的调控提供一定的理论指导,在光束整形、光学微操纵和自由空间光通信等领域有着潜在的应用。In recent years,the partially coherent beam carrying the twisted phase has received extensive attention due to its unique properties.A new partially coherent vector beam endowed with a twisted phase and a special spatial correlation structure is introduced,which is radially polarized twisted rectangular multiGaussian Schellmodel beam.The crossspectral density matrix elements of such beam passing through the ABCD optical system were derived,and the evolution properties,such as the normalized intensity distribution,the spectral degree of coherence(SDOC),and the spectral degree of polarization(SDOP)were investigated in detail.Numerical results show that the intensity distribution of the radially polarized rectangular multiGauss Schellmodel beam without the twist phase gradually evolves from the hollow ring profile in the source plane into the rectangular flattop profile in the focal plane.In comparison,the twisted phase carried by the radially polarized twisted rectangular multiGaussian Schellmodel beam will not only induce the rotation of the beam spot,but also cause a series of changes in the SDOC and SDOP of the beam during the propagation process.The research results provide some theoretical guidance for the control of new vector structured beams with twisted phases,and have potential applications in beam shaping,optical micromanipulation,and free space optical communications.

关 键 词：相干光学与统计光学 部分相干光束 径向偏振 扭曲相位 传输特性 

分 类 号：O436[机械工程—光学工程]