优化封离型CO_2激光工作气体的动力学机理研究  

Study on mechanisms for enhancement kineticsof lasing gases in an optimized sealed-off CO_2 laser

作　　者：程成[1] 

机构地区：[1]浙江工业大学应用物理系,杭州310032

出　　处：《物理学报》2003年第12期3068-3074,共7页Acta Physica Sinica

基　　金：浙江省自然科学基金 (批准号 :60 2 0 98)资助的课题~~

摘　　要：详细讨论了封离型CO2 激光器中CO2 ,N2 和He三混合气体含量被优化组合后的激光动力学机理 .气体优化可以提高激光输出功率的主要机理是通过适当增加N2 含量 ,使N2 激发态与CO2 激光上能级的碰撞频率增加 ,提高了激光能级粒子数密度和相对布居数 .同时 ,适当减少CO2 含量 ,使总的电子动量输运碰撞频率减小、放电电流增大 ,导致增加激光上转动能级的弛豫速率和减小能级寿命 ,从而提高了谐振腔内的激光饱和光强 .The kinetics of gases (CO2, N-2 and He) in an optimized sealed-off CO2 laser are discussed in details. A comparison of numerical results shows that the population of the laser levels is increased by optimizing the lasing gases, with the increase of an excited N-2 impacting to the upper laser level. Also, decreasing the electron momentum transition frequency and increasing discharge current result in the increase of the relaxation of the upper rotational laser levels and the decrease of the level lifetime, thus the lasing saturation intensity in a resonator is increased finally.

关 键 词：二氧化碳激光器 气体动力学 强化机理 输出功率 弛豫速率 振动-转动能级跃迁 

分 类 号：TN248[电子电信—物理电子学]