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理论分析了聚焦泵浦条件对受激布里渊散射反射率的影响，获得反射率与透镜焦点位置、透镜焦距及泵浦光束半径的关系；受激布里渊散射阈值与透镜焦距的关系。理论与实验结果基本上一致。
The influence of focusing pumping conditions on the reflectivity of Stimulated Brillouin scattering is analyzed theoretically. The relationship between the reflectivity and the focal position of the lens, the focal length of the lens and the radius of the pump beam is obtained. The relationship between the threshold of stimulated Brillouin scattering and the focal length of the lens is obtained. The theoretical and experimental results are basically the same.