矢量涡旋光束经光阑-透镜系统的OAM与偏振特性  

Orbital angular momentum and polarization characteristics of vector vortex beam passing through aperture-lens system

作　　者：闫丽凝 吕宏[1] 贺蕊 庞令阳 孔妍 Yan Lining;Lv Hong;He Rui;Pang Lingyang;Kong Yan(School of Optoelectronic Engineering,Xi'an Technological University,Xi'an 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：《红外与激光工程》2022年第12期256-264,共9页Infrared and Laser Engineering

基　　金：陕西省自然科学基础研究计划(2019JM-470);陕西省教育厅科研计划(18JS048)。

摘　　要：与标量涡旋光束不同,矢量涡旋光束同时具有各项异性的空间偏振分布和螺旋相位分布,并携带与相位分布有关的轨道角动量(Orbital angular momentum,OAM)。根据柯林斯衍射积分理论,得到了傍轴近似条件下矢量涡旋光束的OAM密度,实验采集了矢量涡旋光束通过光阑-透镜系统后的光场,详细讨论了光阑截断参数以及光阑-透镜间距等参数对矢量涡旋光场及其OAM密度的影响。结果表明:相比标量涡旋光束,矢量涡旋光束OAM通过光阑系统后随传输距离的衰减更慢,受光阑截断参数影响更小。矢量涡旋光束偏振态不受光阑-透镜系统影响,截断参数大于4.2时,轨道角动量密度和光强不受截断参数影响。在透镜焦点位置处,OAM密度达到最大值。研究结果为矢量涡旋光束OAM特性的应用提供理论依据。Different from the scalar vortex beam(SVB),the vector vortex beam(VVB)has both an anisotropic spatial polarization distribution and a spiral phase distribution,and carries the orbital angular momentum(OAM)related to the phase distribution.Based on the Collins diffraction theory,the OAM density under the paraxial approximation is obtained.The light field of the VVB passing through the aperture-lens system was collected experimentally.The effects of the aperture truncation parameters and the aperture-lens spacing on the light field and the OAM density of the VVB are discussed in detail.The OAM density characteristics of the VVB and the SVB through the aperture are compared.The results show that the OAM has a slower attenuation with the transmission distance after the VVB passes through the aperture-lens system and is less affected by the truncation parameters compared with the SVB.The polarization state of the VVB is not affected by the aperture-lens system.When the truncation parameter is greater than 4.2,the OAM density and light field are not affected by the truncation parameter.The OAM density reaches the maximum value at the focal position of the lens.The research results provide theoretical references for the application of OAM characteristics of VVBs.

关 键 词：矢量涡旋光束 轨道角动量 光学传输矩阵 光阑 截断参数 

分 类 号：O436[机械工程—光学工程]