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以光纤耦合半导体激光器作为泵浦源,5mm长的铯蒸气池作为激光增益介质,开展了端面泵浦铯蒸气激光器的模式匹配实验研究。分析了泵浦光聚焦光斑半径和聚焦位置对铯激光输出性能的影响。以激光器的工作斜效率和光光效率为指标对各模式匹配参数进行了优化,同时对激光器的阈值泵浦功率进行了研究。结果表明:在一定的激光振荡模束腰下,存在最佳的泵浦光聚焦光斑半径使斜效率最大。此外,聚焦位置在蒸气池中央时有利于提高斜效率和光光效率。对阈值泵浦功率的研究显示,阈值泵浦功率随泵浦光聚焦光斑半径的减小而减小,而且当泵浦光聚焦于蒸气池前端时有利于降低阈值泵浦功率。基于以上研究,获得了一组最佳模式匹配参数,即泵浦光聚焦光斑半径为333μm,激光振荡模束腰为167μm,泵浦光聚焦位置位于蒸气池中央。
A fiber-coupled semiconductor laser was used as a pump source and a 5mm-long cesium vapor cell was used as a laser gain medium to carry out an experimental study on mode matching of end-pumped cesium vapor laser. The influence of the focused spot radius and focus position on the output performance of cesium laser was analyzed. The mode matching parameters were optimized with the working efficiency of the laser and the light efficiency as the index, and the threshold pump power of the laser was studied. The results show that under certain laser beam waist, there is the best spot radius for pumping light to maximize the slope efficiency. In addition, the focus position in the center of the steam pool is conducive to improving the ramp efficiency and optical efficiency. The research on the threshold pump power shows that the threshold pump power decreases with the decrease of the spot radius of the pump light, and it is advantageous to lower the threshold pump power when the pump light is focused on the front end of the steam tank. Based on the above studies, a set of optimal pattern matching parameters were obtained. That is, the radius of the focused spot of the pump light is 333μm, the beam waist of the laser oscillation is 167μm, and the focus position of the pump light is located at the center of the steam pool.