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

作　　者：马再如[1] 朱启华[2] 冯国英[1] 陈建国[1] 

机构地区：[1]四川大学电子信息学院,四川成都610064 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2005年第3期391-394,共4页High Power Laser and Particle Beams

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.

关 键 词：自相位调制 峰值光强 啁啾脉冲放大 本底宽度 对比度 

分 类 号：O436[机械工程—光学工程] TN241[理学—光学]