碱金属激光器蒸气室窗口片的标准具效应研究

Etalon Effect of Vapor Cell Windows in Alkali Lasers

实验研究了内表面未镀膜的碱金属蒸气室窗口片的标准具效应对激光输出的影响。研究结果表明:蒸气室两个内表面作为激光输出面时的光斑图样不同,且均伴随有寄生光斑;蒸气室窗口片之间的楔角导致了寄生光斑的产生。将激光器在不同输出耦合率下阈值的实验结果和理论结果进行比较,验证了碱金属蒸气室内表面未镀膜时具有标准具效应,存在多次反射;仅碱金属蒸气室作为输出耦合镜时,标准具效应是输出光斑的主要机制,此时获得了1.8 W的铷激光,其光光效率为10.2%,斜率效率为15.8%。

The influence of the etalon effect on the laser output of the uncoated alkali vapor cell windows on the inner surface is experimentally studied.The research results show that the two inner surfaces have different spot patterns when they are used as the laser output surface,and both of the cases are accompanied by parasitic spots.The parasitic spots are caused by the wedge angle of the two windows of alkali vapor cell.The experimental and theoretical results of the threshold at different output coupling rates are compared.It is verified that the uncoated inner surface of the alkali vapor cell has etalon effect and multiple reflections.When the alkali cell replaces output coupling mirror,the etalon effect is the main factor of the laser output.In this case,the rubidium laser of 1.8 Wis obtained,whose optical efficiency is 10.2% and slope efficiency is 15.8%.