Agile cavity ringdown spectroscopy enabled by moderate optical feedback to a quantum cascade laser

doi:10.29026/oea.2024.240077

	Agile cavity ringdown spectroscopy enabled by moderate optical feedback to a quantum cascade laser
	Qinxue Nie1 ; Yibo Peng2 ; Qiheng Chen 1; Ningwu Liu 1; Zhen Wang 1; Cheng Wang2 ; Wei Ren 1
	2024-09-20
发表期刊	OPTO-ELECTRONIC ADVANCES (IF:15.3[JCR-2023],11.4[5-Year])
ISSN	2096-4579
EISSN	2097-3993
卷号	7 期号:11 页码:240077
发表状态	已发表
DOI	10.29026/oea.2024.240077
摘要	Cavity ringdown spectroscopy (CRDS), relying on measuring the decay time of photons inside a high-finesse optical cavity, offers an important analytical tool for chemistry, physics, environmental science, and biology. Through the reflection of a slight amount of phase-coherent light back to the laser source, the resonant optical feedback approach effectively couples the laser beam into the optical cavity and achieves a high signal-to-noise ratio. However, the need for active phase- locking mechanisms complicates the spectroscopic system, limiting its primarily laboratory-based use. Here, we report how passive optical feedback can be implemented in a quantum cascade laser (QCL) based CRDS system to address this issue. Without using any phase-locking loops, we reflect a moderate amount of light (-18.2 dB) to a continuous-wave QCL simply using a fixed flat mirror, narrowing the QCL linewidth from 1.2 MHz to 170 kHz and significantly increasing the laser-cavity coupling efficiency. To validate the method's feasibility and effectiveness, we measured the absorption line (P(18e), 2207.62 cm-1 ) of N2O in a Fabry-Perot cavity with a high finesse of ~52000 and an inter-mirror distance of 33 cm. This agile approach paves the way for revolutionizing existing analytical tools by offering compact and high-fidelity mid-infrared CRDS systems.
关键词	cavity ringdown spectroscopy optical feedback quantum cascade laser gas sensing
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收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NSFC) , China["52122003","62305279"] ; Innovation and Technology Fund from the Innovation and Technology Commission, Hong Kong SAR, China[GHP/129/20SZ] ; Collaborative Research Fund[C4002-22Y] ; General Research Fund from the University Grants Committee, Hong Kong SAR, China[14208221]
WOS研究方向	Optics
WOS类目	Optics
WOS记录号	WOS:001363094200005
出版者	CAS, INST OPTICS & ELECTRONICS, ED OFF OPTO-ELECTRONIC JOURNALS
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/424491
专题	信息科学与技术学院信息科学与技术学院_PI研究组_王成组信息科学与技术学院_博士生
通讯作者	Cheng Wang; Wei Ren
作者单位	1.Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China 2.School of Information Science and Technology, ShanghaiTech University, Shanghai 201210, China
通讯作者单位	信息科学与技术学院
推荐引用方式 GB/T 7714	Qinxue Nie,Yibo Peng,Qiheng Chen,et al. Agile cavity ringdown spectroscopy enabled by moderate optical feedback to a quantum cascade laser[J]. OPTO-ELECTRONIC ADVANCES,2024,7(11):240077.
APA	Qinxue Nie.,Yibo Peng.,Qiheng Chen.,Ningwu Liu.,Zhen Wang.,...&Wei Ren.(2024).Agile cavity ringdown spectroscopy enabled by moderate optical feedback to a quantum cascade laser.OPTO-ELECTRONIC ADVANCES,7(11),240077.
MLA	Qinxue Nie,et al."Agile cavity ringdown spectroscopy enabled by moderate optical feedback to a quantum cascade laser".OPTO-ELECTRONIC ADVANCES 7.11(2024):240077.