非线性拉曼激光雷达系统检测CO2气体的受激拉曼过程
Stimulated Raman scattering process for nonlinear Raman lidar monitoring atmospheric carbon dioxide
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摘要: 利用气体的受激拉曼散射增益效应的非线性雷达技术是探测大气中的CO2气体的重要方法，用Nd:YAG固体激光器（1 064 nm）的三倍频光（354.7 nm）注入装有CO2和N2高压气体的拉曼管中，气体的受激拉曼散射（SRS）过程产生两种气体的一阶斯托克斯光，用来作为拉曼雷达的发射种子光源。介绍了产生光源的实验装置，论述了SRS中气体气压变化与一阶斯托克斯光能量输出变化的定量关系，得到最佳能量输出的优化条件，并对SRS中一阶斯托克斯光产生过程的物理机制进行了讨论。并根据光源的试验结果，设计了非线性受激拉曼雷达系统，对前期的普通拉曼雷达进行了实验，得到了初步的实验结果。Abstract: The lidar technique based on stimulated Raman scattering (SRS) process has been extensively used in monitoring trace gas concentrations in the atmosphere. To monitor the atmospheric CO2 concentration, a nonlinear Raman lidar based on the SRS process was devised. A third harmonic Nd:YAG laser wave (354.7 nm) was injected into the Raman cells filled with high-pressure gases, CO2 and N2. The first order Stokes lights 371.66 nm(CO2) and 386.7 nm(N2) were generated by the stimulated Raman scattering process. The energy of the first order Stokes lights was measured by changing the gas pressure in the Raman cell and the Nd:YAG laser system output energy. The optimum pressures of CO2 and N2 in the Raman cell were achieved, which were 0.8 MPa and 3.5 MPa respectively. The principles of this physics
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Key words:
- nonlinear raman lidar /
- atmospheric co2 /
- srs process
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