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反应产物基态HF分子对激态HF分子的碰撞弛豫是导致非链式脉冲HF激光器激光能量快速下降的重要原因.为解决该问题,理论分析了3A型分子筛去除基态HF分子的可行性,并开展了实验研究.实验结果表明,在不采用任何激光介质净化技术情况下,激光器重复频率50 Hz出光20s的激光能量下降率高达52%,无法满足高功率重频HF/DF激光器的应用需求.在激光器循环管道中增加3A型分子筛吸附单元之后,激光器连续10余次重复频率50 Hz出光20s的激光能量下降率小于15%,其中首次出光能量下降率仅为7.2%,提高了激光能量稳定性且延长了激光介质使用寿命.3A型分子筛不仅对基态HF分子具有良好吸附效果,而且具有再生活化功能,有望取代非链式脉冲HF激光器激光介质净化技术中常用的化学吸附法.
The collision relaxation of ground-state HF molecule with excited-state HF molecule is one of the important reasons that lead to the rapid decrease of the laser energy in the non-chain pulsed HF laser.In order to solve this problem, the feasibility of removing the ground-state HF molecule from 3A molecular sieve is analyzed theoretically Experimental results show that the laser energy reduction rate of 52% at 20 Hz with 50 Hz repetition rate can not meet the application requirements of high power HF / DF lasers without using any laser medium purification technology. After the 3A molecular sieve adsorption unit was added into the laser circulation pipeline, the laser energy descending rate was less than 15% when the laser was irradiated at 50 Hz for more than 10 repetitions at a frequency of 20 Hz, of which the first drop of energy was only 7.2%, which improved the laser energy stability And prolongs the service life of the laser medium.A type 3A molecular sieve not only has a good adsorption effect on ground state HF molecules but also has the function of regeneration activation, which is expected to replace the commonly used chemisorption method used in the purification of non-chain pulsed HF laser media.