Near-infrared optical-feedback linear cavity-enhanced absorption spectroscopy

Fei XU; Xiao-bin ZHOU; Zheng-bo LIU; Gang ZHAO; Wei-guang MA

doi:10.37188/OPE.2020.0657

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Near-infrared optical-feedback linear cavity-enhanced absorption spectroscopy

Modern Applied Optics | 更新时间：2021-06-21

- Near-infrared optical-feedback linear cavity-enhanced absorption spectroscopy
- Optics and Precision Engineering Vol. 29, Issue 5, Pages: 933-939(2021)
- 作者机构：
  
  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
- 作者简介：
  
  E-mail： gangzhao@sxu.edu.cn
- 基金信息：
- DOI：10.37188/OPE.2020.0657
  CLC： O433.1
- Received：15 December 2020，
  
  Revised：16 January 2021，
  
  Published：15 May 2021
- 稿件说明：
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许非,周晓彬,刘政波等.近红外光学反馈线性腔增强吸收光谱技术[J].光学精密工程,2021,29(05):933-939.

XU Fei,ZHOU Xiao-bin,LIU Zheng-bo,et al.Near-infrared optical-feedback linear cavity-enhanced absorption spectroscopy[J].Optics and Precision Engineering,2021,29(05):933-939.
许非,周晓彬,刘政波等.近红外光学反馈线性腔增强吸收光谱技术[J].光学精密工程,2021,29(05):933-939. DOI： 10.37188/OPE.2020.0657.

XU Fei,ZHOU Xiao-bin,LIU Zheng-bo,et al.Near-infrared optical-feedback linear cavity-enhanced absorption spectroscopy[J].Optics and Precision Engineering,2021,29(05):933-939. DOI： 10.37188/OPE.2020.0657.

摘要

腔增强吸收光谱技术（Cavity Enhanced Absorption Spectroscopy， CEAS）利用激光在腔镜之间的多次反射，增长光与气体介质的作用路径，从而提升探测灵敏度。CEAS的主要噪声来源于激光-腔耦合效率的低下和腔模幅度的起伏。光学反馈腔增强吸收光谱技术（OF-CEAS）基于光学反馈（Optical Feedback， OF）效应，将激光频率锁定到腔模频率上，提高了激光-腔的耦合效率。为了避免光学腔直接反射光引起光学反馈，传统的OF-CEAS大都采用三镜V型谐振腔。然而，实验发现当反馈相位控制恰当时，光学腔直接反射光并不会影响光学反馈，激光可以锁定到光学腔的谐振光上。因此，提出了基于线性F-P腔的OF-CEAS。利用透射腔模的对称性计算得到反馈相位控制的误差信号，实现了激光频率到连续101个腔模频率的锁定。最后对32×10

-6

的甲烷标气进行检测，获得OF-CEAS吸收信号，评估得到的探测灵敏度可达0.54×10

-6

（1

）。

Abstract

Cavity-enhanced absorption spectroscopy （CEAS） utilizes multiple reflections of light between two cavity mirrors to increase the interactions between a laser beam and gas， thus improving detection sensitivity. In CEAS， noise predominantly arises from a low laser-to-cavity coupling efficiency and fluctuations of the cavity mode amplitude. To address such noise， researchers have developed optical-feedback cavity-enhanced absorption spectroscopy technology （OF-CEAS）， which locks the laser frequency to the frequency of the cavity longitudinal mode. As a result， it narrows the laser linewidth and improves the laser-to-cavity coupling efficiency. To avoid direct reflections from the optical cavity for optical feedback， traditional OF-CEAS employs a three-mirror V-shaped resonator. However， based on experimental verification， we have found that when the feedback phase is properly controlled， light directly reflected by the optical cavity does not cause optical feedback， and the laser can be locked to the resonant cavity mode from the optical cavity. Therefore， we propose OF-CEAS based on a linear F-P cavity. The symmetry of the transmission cavity mode is used to generate the error signal for feedback phase control. Then， 101 consecutive cavity transmission modes with a stable amplitude and broad width were observed. Finally， we detected methane standard gas with a concentration of 32×10

-6

and obtained the OF-CEAS absorption signal. Based on the signal to noise ratio， the detection sensitivity down to 0.54×10

-6

（1

） was estimated.

关键词

Keywords

references

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