基于三能级速率方程建立了横向泵浦铷蒸气激光器阈值计算模型，首次详细研究了横向泵浦铷蒸气激光器的泵浦阈值特性。论文结合实际参数，数值模拟了单Bar条半导体激光器横向泵浦铷蒸气的非线性吸收和泵浦光在蒸气室内的传播以及阈值工作状态下小信号增益的分布，仿真分析了蒸气室长度、温度、缓冲气体气压及组份配比、聚焦透镜焦距以及谐振腔诸参数对横向泵浦铷蒸气激光器出光阈值的影响。分析结果表明：对缓冲气体组份配比进行优化可以有效的降低泵浦阈值功率；蒸气室长度与温度共同影响阈值功率；较大的窗口片透过率和不大于70%的输出耦合率可以使泵浦阈值功率保持在较低的水平。文中对铷蒸气激光器等碱金属蒸气激光器的关键部件设计和系统优化可起到借鉴参考的作用。

According to the model, which is based on the three-level rate equations, the threshold characteristics of side-pumped Rb vapor laser was fistly analyzed. The nonlinear absorption of a Bar laser side-pumped Rb vapor laser and the pumped laser propagation in the cell were simuiated in this model. In addition, the distribution of small signal gain under the condition of pumped threshold was well described by this model. In an example, the influence of cell′s length, temperature, gas pressure, gas composition, focus length of focus lens and the parameters of resonant cavity on side-pumped Rb vapor laser was analyzed. The result shows that optimizing proportion of helium and methane can decrease threshold power effectively. Threshold power has combined impact of temperature and cell′s length. High window transmittance and no more than 70% output coupling can make threshold keep in a lower level. It will be helpful to design key components and to optimize systems.