啁啾光脉冲的自相位调制效应对压缩光脉冲的影响

马再如; 朱启华; 冯国英; 陈建国

强激光与粒子束, 2005, 17 (3): 391, 网络出版: 2006-04-28

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

论文大纲

马再如 ^1,2朱启华 ²冯国英 ¹陈建国 ¹

作者单位

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

自相位调制峰值光强啁啾脉冲放大本底宽度对比度 Self phase modulation Peak intensity Chirped pulse amplification Pre-pulse duration Contrast

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.

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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马再如, 朱启华, 冯国英, 陈建国. 啁啾光脉冲的自相位调制效应对压缩光脉冲的影响[J]. 强激光与粒子束, 2005, 17(3): 391. MA Zai-ru, ZHU Qi-hua, FENG Guo-ying, CHEN Jian-guo. Effects of self phase modulation of chirped pulses on compressed pulses[J]. High Power Laser and Particle Beams, 2005, 17(3): 391.

啁啾光脉冲的自相位调制效应对压缩光脉冲的影响

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