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使用准连续二极管激光器进行多重调制光谱检测时,发现吸收光谱信号中存在着丰富的倍频、和频以及差频成分;从激光与气体吸收谱线的非线性作用角度研究了倍频、和频及差频等信号存在的必然性;从实验角度对信号特征进行研究,发现其中有些和频、差频成分的幅度比传统调谐二极管激光吸收光谱技术中的二次谐波信号的幅度更大,有望在准连续调制谱技术中提高检测的灵敏度。
When quasi-continuous diode laser is used for the detection of multiple modulation spectra, it is found that there are many frequency doubling, sum frequency and difference frequency components in the absorption spectrum signal. From the angle of nonlinear effect between laser and gas absorption line, And difference frequency and so on. From the experimental point of view, it is found that some of the sum frequency and difference frequency components have larger amplitudes than the second harmonic signal in the traditional tunable diode laser absorption spectroscopy Sensitivity of detection in quasi-continuous modulation spectroscopy.