摘要
The laser frequency could be linked to an radio frequency through an external cavity by the combination of Pound-Drever-Hall and Devoe-Brewer locking techniques.A stable and tunable optical frequency at wavelength of 1.5μm obtained by a cavity with high finesse of 96000 and a fiber laser has been demonstrated,calibrated by a commercial optical frequency comb.The locking performances have been analyzed by in-loop and out-loop noises,indicating that the absolute frequency instability could be down to 50 kHz over 1 s and keep to less than 110 kHz over 2.5 h.Then,the application of this stabilized laser to the direct absorption spectroscopy has been performed.With the help of balanced detection,the detection sensitivity,in terms of optical density,can reach to 9.4×10^(-6).
作者
周月婷
赵刚
刘建鑫
闫晓娟
李志新
马维光
贾锁堂
Yueting Zhou;Gang Zhao;Jianxin Liu;Xiaojuan Yan;Zhixin Li;Weiguang Ma;Suotang Jia(State Key Laboratory of Quantum Optics&Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)
基金
supported by the National Key R&D Program of China(Grant No.2017YFA0304203)
the National Natural Science Foundation of China(Grant Nos.61875107,61905136,61905134,62175139)
Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi,China(Grant No.2019L0062)
Opening Foundation of Key Laboratory of Laser&Infrared System(Shandong University)。
