声光调QCO_2激光器的动力学模型  

Dynamical Model of Acousto-Optically Q-Switched CO_2 Laser

作　　者：潘其坤[1,2] 谢冀江[1] 阮鹏[1,2] 张来明[1] 李殿军[1] 郭劲[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室,吉林长春130033 [2]中国科学院研究生院,北京100049

出　　处：《中国激光》2011年第7期9-14,共6页Chinese Journal of Lasers

基　　金：激光与物质相互作用国家重点实验室基金(SKLLIM0902-01);吉林省科技厅科技支撑计划(20090358)资助课题

摘　　要：利用六温度模型理论对声光调QCO2激光器的动力学过程进行了理论分析,并与速率方程理论计算的结果进行了比较,证明这两种理论在激光输出性能方面的计算结果基本一致。六温度模型理论模拟的脉冲激光波形有明显的拖尾,与实验结果更相符,且更全面地解释了激光器工作气体中不同分子能级间的能量转移过程。利用六温度模型模拟了输出功率作为输出镜透射率的函数曲线,得到了最佳输出镜透射率参数,其结果与实验相符。实验表明,输出窗口的透射率对激光输出性能影响明显,可通过优化输出镜透射率来改善激光器的输出性能。实验中获得的激光脉冲宽度为160 ns,峰值功率为4750 W。Six-temperature model was used to simulate the theoretical process of dynamical emission in an acousto-optically（AO） Q-switched CO2 laser.Then the result of the simulation is compared with the numerical calculation results by Q-switched pulsed laser rate equations.The numerical calculation results of the two theories are consistent on laser output performance.However,the tail phenomenon is different between numerical calculation results of the six-temperature model theory and rate equations theory.The former is more in agreement with the experimental results.Therefore the theory of six-temperature model more perfectly explained the process of energy transfer between the different molecular energy levels in the laser gain medium.By using the six-temperature model theory,the CO2 pulse laser output performance as a function of the output mirror transmittance is simulated,and the optimum output mirror transmittance is obtained which is consistent with the experimental results.The theoretical analysis and experimental results show that the output mirror transmittance can influence the laser output performance.Therefore the output performance of the AO Q-switched CO2 laser can be improved by optimizing the transmittance of output mirror.The measured peak power of this device is 4750 W and the pulsed width is 160 ns.

关 键 词：激光器 CO2激光器 声光调Q 六温度模型 速率方程 

分 类 号：TN248.22[电子电信—物理电子学]