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141 ps,啁啾系数为1 000,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。
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 1000 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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2005年第3期391-394,共4页
High Power Laser and Particle Beams
