量子电子学报 ›› 2021, Vol. 38 ›› Issue (5): 669-676.doi: 10.3969/j.issn.1007-5461.2021.05.011

• “激光光谱新技术与应用”专辑 • 上一篇    下一篇

腔增强拉曼光谱方法检测痕量氢气

仰青颖1, 程存峰1;2, 孙 羽1;2, 刘安雯1;2, 胡水明1;2∗   

  1. 1 中国科学技术大学合肥微尺度物理科学国家实验室, 安徽 合肥 230026; 2 中国科学技术大学中国科学院量子信息与量子物理卓越创新中心, 安徽 合肥 230026
  • 收稿日期:2021-05-17 修回日期:2021-06-25 出版日期:2021-09-28 发布日期:2021-09-28
  • 通讯作者: E-mail: smhu@ustc.edu.cn E-mail:smhu@ustc.edu.cn
  • 作者简介:仰青颖 ( 1996 - ), 女, 安徽人, 博士生, 主要从事分子光谱精密测量方面的研究。 E-mail: yqy9615@mail.ustc.edu.cn
  • 基金资助:
    Supported by National Natural Science Foundation of China (国家自然科学基金, 21688102)

Cavity-enhanced Raman spectroscopy for trace hydrogen gas sensing

YANG Qingying1, CHENG Cunfeng1;2, SUN Yu1;2, LIU Anwen1;2, HU Shuiming1;2∗   

  1. 1 Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China; 2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2021-05-17 Revised:2021-06-25 Published:2021-09-28 Online:2021-09-28

摘要: 氢气作为潜在的能源载体和工业材料,在众多领域发挥着日益重要的作用。在很多应用中, 对氢气的 检测需要有更高的灵敏度、更快的响应和更大的动态测量范围。腔增强拉曼光谱法 (CERS) 通过 Pound-DreverHall (PDH) 稳频技术将激光和高精细度的光学谐振腔锁定, 实现了 1900 倍的腔内功率增益, 用于痕量氢气的检 测。在 7 mW 的激光输入功率下, 当积分时间为 100 s 时, 自行搭建的腔增强拉曼光谱装置对 H2 的检测限为 2 Pa。实验结果还表明拉曼散射强度与激光功率和气体压力具有良好的线性关系, 示范了 CERS 方法高精度气体 定量分析的潜力。

关键词: 光谱学, 痕量气体检测, 腔增强拉曼光谱, 氢气, 光学谐振腔, Pound-Drever-Hall 技术

Abstract: As a potential energy carrier and industrial material, the increasing importance of hydrogen calls for trace gas detection technique with higher sensitivity, faster response and wider dynamic measurement range. Based on the Pound-Drever-Hall (PDH) laser frequency stabilization technique, laser is coupled into a high-finesse optical resonant cavity in cavity-enhanced Raman spectroscopy (CERS) system, resulting in a power gain factor of 1900 for trace hydrogen gas sensing. With 7 mW input laser power and 100 s exposure time, a detection limit of 2 Pa for hydrogen gas is achieved for the home-made CERS system. Measurements also show that the signal of Raman scattering has an excellent linear relationship with the gas pressure and laser power, which indicates CERS has the potential for quantitative analysis of gases with high precision.

Key words: spectroscopy, trace gas detection, cavity-enhanced Raman spectroscopy, hydrogen, optical resonant cavity, Pound-Drever-Hall technique

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