Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
Opt Lett. 2012 Sep 1;37(17):3615-7. doi: 10.1364/OL.37.003615.
A simple, semi-analytical model of flowing gas diode pumped alkali lasers (DPALs) is presented. The model takes into account the rise of temperature in the lasing medium with increasing pump power, resulting in decreasing pump absorption and slope efficiency. The model predicts the dependence of power on the flow velocity in flowing gas DPALs and checks the effect of using a buffer gas with high molar heat capacity and large relaxation rate constant between the 2P3/2 and 2P1/2 fine-structure levels of the alkali atom. It is found that the power strongly increases with flow velocity and that by replacing, e.g., ethane by propane as a buffer gas the power may be further increased by up to 30%. Eight kilowatt is achievable for 20 kW pump at flow velocity of 20 m/s.
提出了一种流动气体二极管泵浦碱激光器（DPAL）的简单半解析模型。该模型考虑了激光介质中温度随泵浦功率的升高而升高，导致泵浦吸收和斜率效率降低。该模型预测了流动气体 DPAL 中功率对流速的依赖性，并检查了使用具有高热摩尔热容和碱原子 2P3/2 和 2P1/2 精细结构能级之间大弛豫速率常数的缓冲气体的效果。结果发现，功率随流速的增加而强烈增加，并且例如，通过用丙烷代替乙烷作为缓冲气体，功率可以进一步增加高达 30%。在流速为 20 m/s 时，对于 20 kW 的泵浦，可以实现 8 千瓦的功率。
