H_2、D_2及H_2/D_2混合气体受激拉曼特性研究

Investigation of Stimulated Raman Scattering Characteristics in D_2, H_2 and D_2/H_2 Mixtures

受激拉曼散射是扩展激光波长的重要方法,但是气体中非线性光学过程对受激拉曼光的影响非常复杂,实验研究受激拉曼光与气体气压及拉曼池耦合透镜焦距的关系是实际应用受激拉曼光的重要手段。设计了受激拉曼实验装置及其测量系统,采用Nd：YAG激光器的四倍频激光266 nm作为抽运源,活性气体（H2、D2及H2/D2混合气体）分别被密封在长为100 cm的拉曼管中,输出的拉曼激光由棱镜分光后用能量计采集保存用以研究拉曼散射特性。给出了H2、D2及H2/D2混合气体的各级Stokes和反Stokes受激拉曼激光能量与气体气压及透镜焦距的关系。获得了217.84--447.15 nm之间的12条激光谱线,有效地扩展了拉曼激光的应用范围。研究结果对气体受激拉曼光的实际应用具有十分重要的价值。

The stimulated Raman scattering（SRS） is an important method to extend the laser wavelength range. Nonlinear optical processes in gas have complex impacts on SRS laser, so it is important to make an experimental study on the relationship between the characteristic of SRS laser and gas pressure and focal length of lens for applications of SRS laser. The SRS experimental device and measurement system are introduced. Its pump source is a pulsed Nd：YAG laser at 266 nm, and active gases（H2 and D2, H2/D2 mixtures）are sealed in the 100 cm long Raman cell. The outgoing SRS laser split by a prism is measured by an energy meter for the study of SRS characteristics of the active gases. The relationship between the energy of outgoing Stokes and anti-Stokes SRS laser in the H2, D2 and H2/D2 mixtures and gas pressure and focal length of lens is presented. The laser of 12 wavelength bands from 217.84 nm to 447.15 nm are obtained, which effectively expand the scope of the application of Raman laser. The research results have very important practical application value for the use of gas SRS laser.