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差分吸收激光雷达(DIAL)是目前探测大气污染成分最有效的方法之一。介绍了一种新型NO_2激光探测雷达(N(O_2-DIAL)差分吸收光源的设计:选择Nd:YAG的三倍频输出激光作为λ_(on)(354.7nm),并采用该三倍频激光的圆(或椭圆)偏振光抽运D_2拉曼池,选择其中距抽运光波长最接近的第一级纯受激转动拉曼散射光作为特征吸收波长λ_(off)(359.9nm)。抽运光的偏振态调制采用1/4波片调谐技术方便地测定和实现。这一方法保证了两个差分激光的中心波长稳定、频漂小、线宽窄,同时系统只需使用一个拉曼池,即可获得同轴性很好的两束激光输出,在技术指标的提升和经济性两方面都具有很大的优势。
Differential absorption lidar (DIAL) is one of the most effective methods of detecting atmospheric pollution components. A new design of N 2 O 2 -DIAL differential absorption light source is introduced. The third-order output Nd: YAG laser is chosen as the on-wavelength (354.7 nm) laser and the triple-frequency laser The circular (or elliptical) polarized light is pumped in the Raman cell, and the first purely excited Raman scattering light of the first order is chosen as the characteristic absorption wavelength λ off (359.9nm). The polarization state modulation of light is conveniently measured and realized by 1/4 wave plate tuning technology.This method ensures that the central wavelength of the two differential lasers is stable, the frequency drift is small, the line width is narrow, and the system only needs to use one Raman cell, You can get a good coaxial output of the two laser beams, both in technical indicators and economic advantages have great advantages.