Abstract With consideration of the temporal characteristics of the electro-optically cavity-dumped seed laser and fast-axial-flow CW amplifier, a mathematical model describing the dynamic process of nanosecond-pulse CO2 laser amplification is established based on the six-temperature model. This theory perfectly studies the behavior of the CO2 amplifier gain characteristics and variation in the pulse waveform of a nanosecond input pulse. The dependence of the small-signal gain of the amplifier on the discharge current, gas pressure and ratio of CO2 and N2 is studied on theory and experiment, and the evolution of the pulse shape in the gain-extracting stage is simulated. The calculated small-signal gain and output pulse waveforms are in good agreement with the experimental results. The theoretical model can be used to optimize and simulate the amplification performance of a nanosecond-pulse CO2 laser.

中文翻译：

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连续波CO2放大器中纳秒脉冲放大的理论与实验研究

摘要 针对电光倾腔种子激光器和快轴流式连续波放大器的时间特性，基于六温度模型建立了描述纳秒脉冲CO2激光器放大动态过程的数学模型。该理论完美地研究了 CO2 放大器增益特性的行为以及纳秒输入脉冲的脉冲波形变化。理论和实验研究了放大器小信号增益对放电电流、气压和CO2与N2比值的依赖性，模拟了增益提取阶段脉冲波形的演变过程。计算得到的小信号增益和输出脉冲波形与实验结果吻合较好。