Author Affiliations
Abstract
1 School of Science and Technology, Jiangxi Normal University, Nanchang 330022, China
2 State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
3 Jiangxi Key Laboratory of Photoelectronics and Telecommunication, Department of Physics, Jiangxi Normal University, Nanchang 330022, China
4 Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China
Based on nonlinear wave mixing, we experimentally propose a scheme for directly generating optical orbital angular momentum (OAM) by a spirally structured fundamental wave interacting with a nonlinear medium, in which the nonlinear susceptibilities are homogenous. In the experiment, the second-harmonic generation of a fundamental wave carrying positive (negative) integers and fractional OAM states was investigated. This study presents a convenient approach for dynamic control of OAM of vortex beams, which may feature their applications in optical manipulation and optical communication.
vortex beams optical orbital angular momentum spirally structured fundamental wave Chinese Optics Letters
2021, 19(6): 060005
1 江西师范大学 物理与通信电子学院，南昌 330022
2 南昌师范学院 物理系,南昌330022
为得到高准确度的小球藻浓度,利用空芯金属包覆波导作为测量腔对小球藻进行测量.利用自由空间耦合技术激发含有小球藻溶液的空芯金属包覆波导中超高阶导模，通过检测超高阶导模的衰减全反射吸收峰位置和反射极小值Rmin的变化，实现了小球藻溶液浓度和吸收系数的同时测量.该方法不仅可检测10－9 mol量级的小球藻浓度，而且具有测量成本低、操作方便等优点.
小球藻 高阶导模 空芯金属包覆波导 吸收系数 Chlorella Ultrahigh order modes Hollowcore metalcladding waveguide absorption coefficients
江西师范大学 物理与通信电子学院，南昌 330027
通过研究两全同原子初始处于最大纠缠态，光场处于单模时的原子纠缠动力学及Tavis-Cummings模型（TC模型），分析了在TC模型全同原子系统的Hamilton量中加入Stark位移时对原子纠缠的退相干时间的影响.结果表明：不考虑Stark位移时两原子在系统演化过程中周期性地出现退纠缠现象；考虑Stark位移时，两全同原子长时间地纠缠.
量子光学 两全同原子 TavisCummings模型 Stark位移 原子纠缠 Quantum optics Two identity atoms TavisCummings model Stark shift Atomic entanglement
