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室温工作的连续可调谐相干光源在痕量气体检测技术中有着重要的应用价值,非线性差频方法是获得室温工作的中红外相干光源的有效途径,是对传统激光光源的重要补充。报道了一种基于差频方法的室温工作宽调谐中红外激光光谱系统,使用两台近红外半导体激光器作为种子光源,采用PPLN晶体作为非线性混频器件,结合准相位匹配技术实现了3.2-3.7μm中红外相干光源输出,最大差频输出功率约为1μW。对CH4基频吸收谱线的光谱检测表明,系统能够满足在中红外光谱区对气体成分进行高分辨、高灵敏、快速吸收检测的需要。
The continuous tunable coherent light source operating at room temperature has an important application value in the trace gas detection technology. The nonlinear frequency difference method is an effective way to obtain the mid-infrared coherent light source working at room temperature and is an important supplement to the traditional laser light source. A wideband tunable mid-infrared laser spectroscopy system based on the difference frequency method is reported. Two near-infrared semiconductor lasers are used as the seed light source and the PPLN crystal is used as the nonlinear mixing device. Combined with the quasi-phase matching technique, 3.2-3.7 μm mid-infrared coherent light source output, the maximum difference frequency output power of about 1μW. The spectral analysis of CH4 fundamental absorption spectra shows that the system can meet the need of high resolution, high sensitivity and rapid absorption detection of gas components in the mid-infrared spectral region.