电光调QCO_2激光器的六温度模型理论与速率方程理论比较分析

COMPARISON BETWEEN THE THEORIES OF SIX-TEMPERATURE MODEL AND THE RATE EQUATION FOR Q-SWITCHED CO_2 LASER

分别利用速率方程理论和六温度模型理论对Q开关CO2 激光器动力学过程进行了理论分析比较 ,实验上测得电光调Q射频波导CO2 激光器脉冲激光建立时间及峰值功率与速率方程理论和六温度模型理论计算结果一致 .但速率方程理论计算的激光脉冲宽度较“窄” ,并且几乎没有拖尾 ,而六温度模型理论计算的脉冲激光波形有明显的拖尾 ,符合实际测量的波形 .另外 ,六温度模型理论可以全面反映激光器工作气体中不同分子能级的能量转移过程 。

The theories of rate equation and six-temperature model for CO2 lasers are used to describe the process of the dynamic emission in the electrooptically Q-switched CO2 laser. The peak power and delay time of Q-switched laser calculated by the two theories are well consistent with the experiments. The calculated pulse width of Q-switched laser using the theory of rate equation is narrow and the tailing is too short. However, a theoretical analysis by using the six-temperature model is consistent with the measured waveform and the tailing is obvious. In addition, the processes of energy-transfer of all kinds of molecular levels are considered in the six-temperature model. So compared to the rate equation, the six-temperature model makes a better analysis.