Zhang Dongqing, Zhang Hui, Fan Hongqiang, Hu Mengpeng, Wang Haoran, Zhou Junfeng, Lv Jinguang, Liang Jingqiu, Wang Qiang
Opt Express. 2024 Sep 9;32(19):33618-33627. doi: 10.1364/OE.536849.
We report a trace gas sensing technique of cavity-enhanced light-induced thermoelastic spectroscopy (CE-LITES) with a Fabry-Pérot (F-P) optical cavity and a high-quality-factor resonant quartz tuning fork (QTF). Pound-Drever-Hall (PDH) locking method is used to lock the laser to the optical cavity. With only a short 9-cm optical cavity (finesse, ∼1283) and a tiny commercially available standard QTF (Q-factor, ∼38910), a CE-LITES sensor for acetylene detection was developed to demonstrate this technique, achieving a minimum detection limit (MDL) of 7.5 parts-per-billion (ppb) for a 216-s integration time and a normalized noise equivalent absorption (NNEA) coefficient of as low as 1.91 × 10cm·W·Hz. The developed technique bears promising potential for sensitive and accurate measurement that is needed for studying trace gas-phase analyte.
我们报道了一种采用法布里-珀罗（F-P）光学腔和高品质因数共振石英音叉（QTF）的腔增强光致热弹性光谱（CE-LITES）痕量气体传感技术。采用庞德-德雷弗-霍尔（PDH）锁定方法将激光锁定到光学腔。仅使用一个短的9厘米光学腔（精细度约为1283）和一个微小的市售标准QTF（品质因数约为38910），开发了一种用于乙炔检测的CE-LITES传感器来演示该技术，在216秒积分时间内实现了7.5十亿分之一（ppb）的最低检测限（MDL），归一化噪声等效吸收（NNEA）系数低至1.91×10⁻⁹cm·W⁻¹·Hz⁻¹/²。所开发的技术在研究痕量气相分析物所需的灵敏和准确测量方面具有广阔的应用前景。
