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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。
Based on the three-level rate equation, a threshold calculation model of a transversely pumped rubidium vapor laser is established. The pumping threshold characteristics of a transversely pumped rubidium vapor laser are studied in detail for the first time. In this paper, the non-linear absorption of the rubidium vapor transversely pumped by a single Bar semiconductor laser and the propagation of the pump light in the vapor chamber and the distribution of the small signal gain under the threshold operating conditions are numerically simulated. The effects of the vapor chamber length, temperature , The influence of gas pressure and component ratio, the focal length of the focusing lens and parameters of the resonator on the light-extraction threshold of a transversely pumped rubidium vapor laser were investigated. The results show that the pumping power can be effectively reduced by optimizing the composition of the buffer gas. The length of the chamber and the temperature together affect the threshold power. The larger transmittance of the window and the output coupling rate of less than 70% Keep the pump threshold power at a low level. In this paper, the key components design and system optimization of alkali metal vapor laser such as rubidium vapor laser can play a reference role.