The angular spectrum of a vectorial laser beam is expressed in terms of an intrinsic coordinate system instead of the usual Cartesian laboratory coordinates. This switch leads to simple, elegant and new expressions such as for the angular spectrum of the Hertz vector corresponding to the electromagnetic fields. As an application of this approach, we consider axially symmetric vector beams, showing non-diffracting properties of these beams, without invoking the paraxial approximation. Further, we indicate the relevance of the method for analyzing nonparaxial resonators, such as microresonators
Reconfigurable Momentum-space vectorial lasing enabled by Quasi-BIC
Key Laboratory of Multiscale Spin Physics (Ministry of Education), Applied Optics Beijing Area Major Laboratory, School of Physics and Astronomy, Beijing Normal University（北京师范大学物理与天文学院，多尺度自旋物理教育部重点实验室，应用光学北京地区重大实验室）
Relaxing Coherence Requirements on Laser Sources for Nanoscopy through Optical Fiber Technique
Max Planck Institute for Polymer Research（马克斯·普朗克聚合物研究所）；School of Electrical and Information Engineering, Anhui University of Science and Technology（安徽理工大学电气与信息工程学院）；Institute of Molecular Biology (IMB)（分子生物学研究所）；Institute of Fiber Optics, The Key Laboratory of Specialty Fiber Optics and Optical Access Network, Shanghai University（上海大学光纤技术研究所特种光纤与光接入网络重点实验室）；State Key Laboratory of Satellite Network, Shanghai Key Laboratory of Satellite Network, Shanghai Satellite Network Research Institute Co., Ltd（上海卫星网络研究所有限公司卫星网络国家重点实验室卫星网络上海市重点实验室）；Department of Electrical and Photonics Engineering, Technical University of Denmark（丹麦技术大学电气与光子工程系）
Three-laser coherent population trapping in a multi-lambda system: theory, experiment and applications
我们提出了多能级$^{40}$ Ca $^+$型结构上相干布居俘获谱的理论和实验结果，在标准的双激光$Λ$系统中加入第三束光以避免不需要的光泵浦。我们表明，额外的激光可以保持暗共振的性质或引入退相干取决于它的功率。实验进行了使用一个单一的捕获$^{40}$钙$^+$离子在$S_{1/2}-P_{1/2}-D_{3/2}$歧管。从理论上讲，这个问题是解决了一个Floquet类展开的Liouvillian正确预测所有的测量光谱，而不需要全时间积分。作为第一个应用程序的多激光技术，我们表明，获得的更丰富的光谱可以用作一个矢量偏振仪的光束之一，允许一个测量电场在任何空间方向上的离子位置。我们还解释了如何我们的设置可以实现一个温度计与可调的灵敏度和没有激光线宽的依赖。
