论文部分内容阅读
在北京大学200TW激光系统上,测量了经可编程声光色散滤波器不同程度光谱调制后放大器输出脉冲的频域分布,并设计了一个与脉冲中心波长、光谱宽度等参数相关的光谱调制函数拟合了实验测得的光谱数据。该函数形式简单,适用于不同的激光系统。对实验系统中种子脉冲经光谱调制后从放大器输出的光谱结果进行了数值模拟,对比研究了普通种子脉冲和光谱调制脉冲经放大器增益后时域空间内的物理性质;讨论了光谱调制对系统最终输出脉冲峰值功率的影响。结果表明:光谱调制会导致脉冲旁瓣的产生,降低系统输出脉冲的有效能量和飞秒对比度,系统输出脉冲为平顶光谱时,其有效输出峰值功率最大。
In the 200TW laser system of Peking University, the frequency distribution of the output pulse of the amplifier modulated by different levels of programmable AOD filter was measured. A spectral modulation function Combined with the experimental measured spectral data. This function is simple in form and suitable for different laser systems. The spectral results of the output from the amplifier after the spectral modulation of the seed pulse in the experimental system were numerically simulated, and the physical properties in the time domain space of common seed pulse and spectral modulation pulse after gain gain were compared. The effects of spectral modulation on the system final Effect of output pulse peak power. The results show that the spectral modulation can lead to the generation of pulse sidelobe, reduce the effective energy and the femtosecond contrast of the system output pulse, and the peak output power of the system is the maximum when the system output pulse is flat-topped spectrum.