啁啾光脉冲的自相位调制效应对压缩光脉冲的影响
Effects of self phase modulation of chirped pulses on compressed pulses
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摘要: 在超强激光系统中，对比度和本底宽度是压缩光脉冲极为重要的指标。在啁啾脉冲放大系统的压缩阶段，在啁啾脉冲宽度为141ps，啁啾系数为1000，B积分值分别为0，1和2的情况下，模拟了自相位调制效应（SPM）对压缩脉冲的峰值光强、脉冲宽度和本底宽度的影响。结果表明：在B积分值为2的条件下，若不补偿非线性色散，压缩脉冲的峰值强度降为无自相位调制效应时的65%左右，脉冲宽度约为种子脉冲宽度的2倍，本底宽度则增加到原来的3倍左右；在B积分值大于0.5的情况下，本底宽度和B积分值近似成线性关系。Abstract: The pre-pulse duration and contrast are very important in the ultra-high power CPA laser system. The effects of the self phase modulation (SPM) were simulated on the peak intensity, pre-pulse duration and contrast of the compressed pulse, when the chirped pulse duration was 141 ps, the chirp coefficient was 1 000 and the B-integral value was 0, 1 or 2. The results show that when the B-integral value is 2, the SPM causes the peak intensity of the compressed pulse to decrease to 65%, and the pulse duration and pre-pulse duration to increase to 200 % and 300% respectively. When the B-integral ranges from 0.5 to 2, an approximate linear formulation can be used to describe the relationship between the pre-pulse duration and the B-integral value.
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Key words:
- self phase modulation /
- peak intensity /
- chirped pulse amplification /
- pre-pulse duration /
- contrast
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