Author Affiliations
Abstract
1 School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu 273165, China
2 School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
3 National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Orbital angular momentum (OAM), as a fundamental parameter of a photon, has attracted great attention in recent years. Although various properties and applications have been developed by modulating the OAM of photons, there is rare research about the non-uniform OAM. We propose and generate a new kind of continuously tunable azimuthally non-uniform OAM for the first time, to the best of our knowledge, which is carried by a hybridly polarized vector optical field with a cylindrically symmetric intensity profile and a complex polarization singularity. We also present the perfect vector optical field carrying non-uniform OAM with a fixed radius independent of topological charges, which can propagate steadily without radial separation, solving the problem of the unsteady propagation due to the broadened OAM spectrum of the non-uniform OAM. This new kind of tunable non-uniform OAM with a cylindrical symmetric intensity profile, complex polarization singularity, and propagation stability enriches the family of OAMs and can be widely used in many regions such as optical manipulation, quantum optics, and optical communications.
orbital angular momentum vector optical field singular optics phase singularity polarization singularity Chinese Optics Letters
2020, 18(12): 122601
1 南开大学物理科学学院,弱光非线性光子学教育部重点实验室, 天津 300071
2 南京大学固体微结构物理国家重点实验室,人工微结构科学与技术协同创新中心, 江苏 南京 210093
3 曲阜师范大学物理工程学院,山东省激光偏光与信息技术重点实验室, 山东 曲阜 273165
作为光的一个基本属性,偏振态提供的自由度对光场调控具有重要作用。具有空间结构偏振态分布的矢量光场因其具有不同于传统标量光场的独特性质而被应用于诸多领域,但矢量光场的早期研究主要集中于柱对称的局域线偏振矢量光场。近年来,偏振态分布更加丰富的新型矢量光场逐渐得到关注,这些新型矢量光场的出现丰富了矢量光场的种类并提供了新的调控自由度,被应用于焦场调控、光学微加工、光学微操纵和光信息传输等领域。综述了近年来出现的新型矢量光场,包括柱坐标系中的杂化偏振矢量光场、庞加莱球相关的矢量光场、阵列矢量光场、多奇点矢量光场和其他非柱对称的矢量光场,介绍了其进展、设计方案、实验生成、性质和相关应用。
物理光学 偏振态 矢量光场 光场调控 庞加莱球 奇点
1 杭州电子科技大学 电子信息学院,浙江 杭州310018
2 聚光科技(杭州)股份有限公司,浙江 杭州310052
在干涉型分布式光学振动传感系统中,双马赫-曾德尔技术具有较高的定位精度和较低的成本,更受关注。现搭建了双马赫-曾德尔分布式光纤传感系统,并对其进行了定位实验,阐述了检测系统的组成和原理。对基于互相关算法的定位性能进行研究,测试了其单点定位和多点定位功能,指出其定位局限性。另外重点分析了影响该系统定位稳定性的因素,提出一种数据处理算法,以提高其定位稳定性。实验结果表明,经过该算法数据处理之后,系统定位稳定性和可靠性得到极大提高。
分布式光纤传感器 定位技术 马赫-曾德尔干涉仪 互相关算法 distributed fiber-optic sensor locating technology Mach-Zehnder interferometer cross-correlation algorithm
