超短脉冲在单块晶体中的三次谐波理论模拟  

Study on Third-Harmonic Generation of Ultra-short Pulse in Single Crystal

作　　者：韩耀锋[1] 李琨[1] 张彬[1] 蔡邦维[1] 李恪宇[2] 朱启华[2] 

机构地区：[1]四川大学电子信息学院,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：《光子学报》2007年第4期617-621,共5页Acta Photonica Sinica

基　　金：四川省学术和技术带头人培养基金项目(2200306);超强超短脉冲激光应用研究实验室开放课题(CD200508)资助

摘　　要：讨论了群速度失配、自相位调制和交叉相位调制、晶体厚度、基波的频率啁啾等因素对超短脉冲单块晶体的三次谐波转换效率、三倍频光脉冲形状以及频谱的影响.结果表明:群速度延迟使三倍频光脉冲展宽;自相位调制和交叉相位调制会降低转换效率,并使三倍频光脉冲形状发生畸变;晶体厚度对三倍频光脉冲频谱展宽有着较大的影响;合适的基频光频率啁啾可以减小三倍频光脉冲的畸变,并有效地提高三倍频转换效率.　The effects of group-velocity mismatch,self-and cross-phase modulation,the thickness of crystal,and the chirp of fundamental field on the conversion efficiency,pulse shape and spectrum of third-harmonic field were discussed.The results show that group-velocity mismatch broadens the width of third-harmonic pulse.Self-and cross-phase modulation not only reduces the tripling efficiency,but also distorts the shape of third-harmonic pulse.The thickness of crystal has effect on the spectrum distribution of third-harmonic field.Furthermore,the suitable chirp of fundamental field can reduce the distortion of third-harmonic pulse and increase the third-harmonic conversion efficiency.

关 键 词：群速度失配 自相位调制 交叉相位调制 频率啁啾 转换效率 

分 类 号：O437.1[机械工程—光学工程]