短蒸气室自加热碱金属激光器的原理是利用未被增益介质吸收的抽运光加热碱金属蒸气室。基于三能级速率方程, 建立了半导体激光双端抽运碱金属激光器的理论模型, 研究了增益介质长度、蒸气室温度和抽运源线宽等参数对短蒸气室自加热碱金属激光器输出激光的影响。研究结果表明, 在普通外腔半导体激光器抽运下, 增益介质长度为2 mm时可以实现瓦级激光输出, 选择较高的抽运光功率可提高自加热碱金属激光器的输出功率。该研究结果将为自加热碱金属激光器的实验提供理论基础, 并可进一步拓展小功率碱金属激光器的应用领域。

The pump light unabsorbed by gain medium is used to heat alkali vapor cell in a self-heated alkali laser with a mini vapor cell. A theoretical model of alkali laser under semiconductor laser double-end pumping is constructed, and the influences of the length of gain medium, the temperature of vapor cell and the linewidth of pumped source on the output laser of the self-heated alkali laser with a mini vapor cell are analyzed. The results show that, pumped by a common external cavity semiconductor laser, the W-class output laser can be achieved when the length of gain medium is 2 mm. The output power of the self-heated alkali laser can be improved with a high pump power. The research results offer the theoretical foundation for the self-heated alkali laser experiment, and expand the application of alkali laser with low power.