1 山西大学激光光谱研究所量子光学与光量子器件国家重点实验室，山西 太原 030006
2 山西大学极端光学协同创新中心，山西 太原 030006
3 国家电网重庆市电力公司电力科学研究院，重庆 404100
展示一种基于可调谐半导体激光吸收光谱技术（TDLAS）的微型化纳米光纤甲烷传感器。在比尔-朗伯定律的基础上，选择1.6 μm附近的甲烷吸收线，对分布式反馈半导体激光器（DFB-DL）进行波长调制，使用锁相放大器解调出二次谐波信号，建立一套完整的基于纳米光纤的TDLAS系统。使用该系统测量室温下不同入射功率和不同压强对二次谐波信号的影响，同时获得了该系统的压力展宽系数和压力频移系数，发现直径较小的纳米光纤可以对甲烷产生更强的吸收。所设计的纳米光纤传感器是一个在低功率条件下进行微量气体测量的有力工具，在气体种类分析和定量分析方面有着巨大的应用潜力。
激光光谱技术 可调谐半导体激光吸收光谱技术 分布式反馈半导体激光器 纳米光纤 激光与光电子学进展
2023, 60(6): 0628011
Author Affiliations
Abstract
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
We report the experimental realization of dark state atoms trapping in a nanofiber optical lattice. By applying the magic-wavelength trapping potentials of cesium atoms, the AC Stark shifts are strongly suppressed. The dark magneto-optical trap efficiently transfers the cold atoms from bright (6S1/2, F = 4) into dark state (6S1/2, F = 3) for hyperfine energy levels of cesium atoms. The observed transfer efficiency is as high as 98% via saturation measurement. The trapping lifetime of dark state atoms trapped by a nanofiber optical lattice is also investigated, which is the key element for realizing optical storage. This work contributes to the manipulation of atomic electric dipole spin waves and quantum information storage for fiber networks.
nanofiber atomic trapping optical lattice dark state Chinese Optics Letters
2022, 20(2): 020201
