title: Intensity-Stabilized Fast-Scanned Direct Absorption Spectroscopy Instrumentation Based on a Distributed Feedback Laser with Detection Sensitivity down to 4 × 10-6.
abstract: A novel, intensity-stabilized, fast-scanned, direct absorption spectroscopy (IS-FS-DAS) instrumentation, based on a distributed feedback (DFB) diode laser, is developed. A fiber-coupled polarization rotator and a fiber-coupled polarizer are used to stabilize the intensity of the laser, which significantly reduces its relative intensity noise (RIN). The influence of white noise is reduced by fast scanning over the spectral feature (at 1 kHz), followed by averaging. By combining these two noise-reducing techniques, it is demonstrated that direct absorption spectroscopy (DAS) can be swiftly performed down to a limit of detection (LOD) (1σ) of 4 × 10-6, which opens up a number of new applications.
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. zhaogang030006@126.com.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. zhaogang030006@126.com.
authors.forename: Gang
authors.initials: G
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. tanwei8648@126.com.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. tanwei8648@126.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Tan
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. m18234129833@163.com.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. m18234129833@163.com.
authors.forename: Mengyuan
authors.initials: M
authors.lastname: Jia
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. jiajuanhou@163.com.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. jiajuanhou@163.com.
authors.forename: Jiajuan
authors.initials: J
authors.lastname: Hou
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. mwg.@sxu.edu.cn.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. mwg.@sxu.edu.cn.|Department of Physics, Umeå University, Umeå SE-901 87, Sweden. mwg.@sxu.edu.cn.
authors.forename: Weiguang
authors.initials: W
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. donglei@sxu.edu.cn.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. donglei@sxu.edu.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. k1226@sxu.edu.cn.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. k1226@sxu.edu.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Electrical Engineering and Automation, Shanxi Polytechnic College, Taiyuan 030006, China. fengxx0351@163.com.
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Feng
authors.affiliation: Shanxi Guohui Optoelectronic Technology CO., Ltd., Taiyuan 030006, China. jerry@ghopto.com.
authors.forename: Xuechun
authors.initials: X
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. ywb65@sxu.edu.cn.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. ywb65@sxu.edu.cn.
authors.forename: Wangbao
authors.initials: W
authors.lastname: Yin
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. xlt@sxu.edu.cn.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. xlt@sxu.edu.cn.
authors.forename: Liantuan
authors.initials: L
authors.lastname: Xiao
authors.affiliation: Department of Physics, Umeå University, Umeå SE-901 87, Sweden. ove.axner@umu.se.
authors.forename: Ove
authors.initials: O
authors.lastname: Axner
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. jggp@sxu.edu.cn.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China. jggp@sxu.edu.cn.
authors.forename: Suotang
authors.initials: S
authors.lastname: Jia
keywords: DFB laser; direct absorption spectroscopy; fast scanning; intensity stabilization; polarization rotator; relative intensity noise