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主振荡-功率放大是获得高功率脉冲染料激光的有效模式,染料激光脉冲在放大过程中,与抽运激光脉冲的时序匹配是获得高效转换的基本条件之一。采用速率方程对高重复频率、调Q和倍频Nd:YAG激光正向抽运脉冲放大过程进行了数值模拟,研究了实际应用中,抽运激光脉宽大于染料激光脉宽条件下的放大过程的时间特性。结果显示,当最佳时序匹配时,抽运激光脉冲峰值相对信号激光延迟具有纳秒量级的滞后,抽运激光脉冲越宽,滞后越多,同时,染料分子的激发-受激辐射-再激发的动态过程造成放大后的染料激光脉冲被展宽,分析显示采用固定抽运激光脉冲峰值位置的方法进行时序控制是可行的。
Main oscillation-power amplification is an effective mode for obtaining high-power pulsed dye laser. One of the basic conditions for efficient conversion is to match the timing of the pulsed laser pulses during amplification of the dye laser pulse. The rate equations were used to numerically simulate the pulse amplifying process of high repetition rate, Q-switched and frequency-doubled Nd: YAG laser. The pulse width of pumping laser was larger than that of dye laser in practical applications The time characteristics. The results show that when the best timing is matched, the peak of pumping laser pulse lags behind that of signal laser with a lag of nanosecond. The wider the pumping laser pulse is, the more hysteresis is. At the same time, the excitation - stimulated emission of dye molecules - The dynamic process of excitation causes the amplified dye laser pulse to be broadened. Analysis shows that it is feasible to use the method of fixed-pump laser pulse peak position for timing control.