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量子级联(QC)激光器是唯一能在室温产生中红外辐射的半导体激光器。它的宽调谐范围、高输出功率和单模工作的特性,使得它非常适用于高分辨率光谱分析。结合中红外光谱区是气体分子的基频强吸收特性,基于室温脉冲工作的量子级联激光器的吸收光谱检测技术以其灵敏度高、选择性强及响应快速等特点,成为痕量气体探测的有效方法。介绍了基于分布式量子级联激光器的脉间光谱技术,通过分析比较不同工作参数下的激光光谱信号,寻求最佳的激光器工作参数,并且在选定的工作参数下对目标气体的吸收谱线进行测量,得到了中心在2178.2cm-1附近的N2O的吸收谱线。
Quantum Cascade (QC) lasers are the only semiconductor lasers that produce mid-infrared radiation at room temperature. Its wide tuning range, high output power and single-mode operation make it ideally suited for high-resolution spectral analysis. Combining the mid-infrared spectral region with the strong absorption at the fundamental frequency of gas molecules, the absorption spectroscopy detection of quantum cascade lasers based on pulsed at room temperature has become an effective method for trace gas detection due to its high sensitivity, selectivity and rapid response method. This paper introduces pulse-pulse spectroscopy based on distributed quantum cascade lasers. By analyzing and comparing the laser spectral signals under different operating parameters, the optimal laser operating parameters are sought and the absorption spectra of the target gas under the selected operating parameters The absorption spectra of N2O with a center of 2178.2 cm-1 were obtained.