氧碘化学激光器输出功率的估算  

Calculation for output power of chemical oxygen iodine laser

作　　者：刘万发[1] 韩新民[1] 金玉奇[1] 桑凤亭[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《强激光与粒子束》2007年第1期49-52,共4页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题;国家自然科学基金资助课题(10474097)

摘　　要：建立了激光在工作时的动态模型,即假设在单位时间内,激光介质的粒子数全部被泵浦到上能级。引入激光介质重复泵浦次数的概念,根据能量守恒原理,通过分析氧碘化学激光器(COIL)的传能机理,计算了沿气流方向变化的碘原子上能级的弛豫时间及沿气流方向变化的碰撞传能时间,并且计算了碘原子在出光区内被单重态氧反复泵浦的次数及相应的残余单重态氧数目,从而计算出碘原子在出光区的反复泵浦次数,修正了原计算COIL输出功率的公式。理论计算与实验结果均表明:当碘流量过低时,增益小于损耗,激光器不能起振;当增大碘流量时,激光输出功率也逐步增大,反复泵浦次数逐渐减少;当碘流量继续增大时,激光输出功率达到最大,且在一定碘流量变化范围内基本保持稳定;但随着碘流量的进一步增大,激光输出功率却逐步下降。The concept of repetitively-pumped times of atomic iodine in COIL was introduced. According to the law of energy-conservation, an equivalent lasing model was built. The non-extractable residual energy while lasing, the relaxation period for upper energy-level of atomic iodine and the energy-transfer period of collision between singlet oxygen and atomic iodine were calculated. The calculation formula for COIL output power agrees better with the experimental results than the original one does. Both theoretical and experimental results indicate that., if the iodine flow rate is too low, the laser gain is less than the loss, and the laser cannot start operating. If the iodine flow rate is increased gradually, the laser output power increases accordingly, and the repetitively-pumped times of the iodine decreases gradually. When the iodine flow rate is increased into a certain range, the laser power outputs a maximum, and the power is relatively stable vs iodine flow rate in this range. If the iodine flow rate is increased further and beyond this range, the laser power decreases gradually.

关 键 词：氧碘化学激光器 单重态氧 碘原子 泵浦次数 弛豫时间 碰撞传能时间 

分 类 号：TN248.5[电子电信—物理电子学]