Yao Zhongyi, Wang Xinbing, Zuo Duluo
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
Sensors (Basel). 2025 Jul 25;25(15):4600. doi: 10.3390/s25154600.
An external power build-up cavity of a line-narrowed 407-nm laser diode for Raman gas analysis was demonstrated to possess good gas detection capabilities. By employing an ordinary laser diode without anti-reflection coating or and a bandpass interference filter in an external cavity resonance, the laser linewidth was narrowed by resonant optical feedback, and tens of watts of external cavity power were built up. The coupling mechanism between the semiconductor laser and the external cavity are discussed, as well as the noise background in the experimental results. The Raman spectrum of ambient air was analyzed, achieving a methane detection limit of 1 ppm.
用于拉曼气体分析的线窄化407纳米激光二极管的外腔功率增强腔被证明具有良好的气体检测能力。通过在外部腔共振中使用没有抗反射涂层的普通激光二极管和带通干涉滤光片，激光线宽通过共振光反馈变窄，并且建立了数十瓦的外腔功率。讨论了半导体激光器与外腔之间的耦合机制以及实验结果中的噪声背景。分析了环境空气的拉曼光谱，实现了1 ppm的甲烷检测限。
