摘要
为了研究矢量扭曲光束在梯度折射率光纤中的自旋轨道相互作用,采用广义惠更斯-菲涅耳积分和ABCD传输矩阵方法,得到了一类径向偏振扭曲高斯-谢尔模光束在梯度折射率光纤中的交叉光谱密度矩阵元素表达式,详细分析了传输过程中的光强、偏振态、自旋角动量和轨道角动量的空间分布特性。结果表明,光束在传输过程中偏振态分布逐渐改变并产生了自旋角动量,发生了周期性的自旋轨道相互转换,并在焦平面L/2处达到转换极值;通过调控扭曲因子和相干长度可以实现对光束的光斑形状和偏振椭圆进行设计。此研究结果在光纤高容量通信、加密通信等方面展现出广阔的应用潜力与前景。
In order to study the spin-orbit interaction of vector twisted beams in gradient index(GRIN)fibers,the generalized Huygens-Fresnel integral and ABCD transmission matrix method were employed to obtain the cross-spectral density matrix-element expressions of a class of radially polarized twisted Gaussian-Schell model beams in GRIN fibers,and a detailed analysis of the transmission process was performed.The spatial distribution characteristics of light intensity,polarization state,spin angular momentum and orbital angular momentum during the transmission process were analyzed in detail.The results show that the polarization state distribution of the beam gradually changes and generates spin angular momentum during the transmission process,and periodic spin-orbit interconversion occurs and reaches the conversion extreme at the focal plane L/2.The design of the spot shape and polarization ellipse of the beam can be achieved by tuning the twist factor and coherence length.The research results show a broad application potential and prospect in fiber optic high-capacity communication and encrypted communication.
作者
梁雅茹
鲁博瑞
霍楠
尹晓金
王静
LIANG Yaru;LU Borui;HUO Nan;YIN Xiaojin;WANG Jing(Shanxi Center of Technology Innovation for Light Manipulations and Applications,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《激光技术》
北大核心
2025年第5期633-641,共9页
Laser Technology
基金
国家自然科学基金资助项目(62305238,12304402,11904253)
山西省基础研究计划资助项目(202303021212212)。
作者简介
通信作者:王静,wangjingtyust@163.com。
