光谱调制对放大器脉冲时域特性的影响

发布时间：2018-09-18 18:36

【摘要】：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。
[Abstract]:In the 200TW laser system of Peking University, the frequency domain distribution of the output pulse of the amplifier after different spectral modulation by programmable acousto-optic dispersion filter is measured, and a wavelength corresponding to the center of the pulse is designed. Spectral data measured by experiments are fitted with spectral modulation function related to spectral width and other parameters. The function is simple and suitable for different laser systems. The spectral output of the seed pulse from the amplifier is simulated numerically, and the physical properties of the ordinary seed pulse and the spectral modulation pulse in the time domain after the gain of the amplifier are compared. The effect of spectral modulation on the final output peak power of the system is discussed. The results show that spectral modulation can lead to the generation of pulse sidelobe and reduce the effective energy and femtosecond contrast of the output pulse. When the output pulse of the system is flat-top spectrum, the maximum effective output peak power is obtained.
【作者单位】：北京大学核物理与核技术国家重点实验室;
【基金】：国家自然科学基金(11504009,11535001) 国家重大科学仪器设备开发专项(2012YQ030142)
【分类号】：TN24;TN722

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