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扩展了脉冲CO2激光器的多频动力学理论。将多频动力学模型中的光强方程用光场方程代替,建立了脉冲CO2激光器注入锁定的理论计算模型。采用四阶经典龙格库塔(Runge-Kutta)算法,计算了不同注入信号强度和失谐频率下的激光输出功率、瞬时频率和增益系数。研究了注入锁定宽调谐横向激励大气压(TEA)CO2激光器模式锁定的稳定性问题。研究结果表明,当频率偏离谱线中心600 MHz时,为了实现稳定的模式锁定所需要的注入信号强度应比在谱线中心处高出两个数量级。理论结果和已发表的实验数据符合得很好。研究进一步预示:当激光器气压增大至10倍大气压时,对于同样调谐范围所需的注入信号强度仅比在谱线中心处高出10%左右。
Extended multi-frequency dynamics of pulsed CO2 lasers. The light intensity equation in the multi-frequency dynamic model was replaced by the light-field equation, and the theoretical calculation model of injection-locked CO2 laser was established. The fourth order classical Runge-Kutta algorithm was used to calculate the laser output power, instantaneous frequency and gain coefficient under different injected signal strengths and detuning frequencies. The stability of injection locked wide locked transversely excited atmospheric pressure (TEA) CO2 laser mode locking was investigated. The results show that the injected signal strength required for stable mode locking should be two orders of magnitude higher than at the center of the line when the frequency deviates from the center of the line at 600 MHz. The theoretical results are in good agreement with published experimental data. The study further predicts that when the laser pressure is increased to 10 times atmospheric pressure, the injected signal intensity required for the same tuning range is only about 10% higher than at the center of the line.