超短脉冲3次谐波转换研究  

Study on Third-Harmonic Generation of Femtosecond Pulse

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：《四川大学学报（自然科学版）》2006年第3期574-578,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：四川省青年科技基金(05ZQ026-013);四川省学术和技术带头人培养资金(2200306)

摘　　要：针对由三阶非线性效应引起的I类角度失谐3次谐波转换进行了研究,讨论了群速度失配、自相位调制和交叉相位调制、晶体厚度以及失谐角度对3倍频光脉冲波形、频谱及转换效率的影响.研究结果表明:群速度延迟使转换效率下降,3倍频光脉冲展宽;自相位调制及交叉相位调制会降低转换效率,使3倍频光脉冲形状发生畸变;晶体厚度对3倍频光脉冲的展宽和转换效率均有较大影响;合适的失谐角度可有效地提高转换效率.The type-Ⅰ phase-matched thlrd-harmonic generation induced by third-order nonlinear optical process has been studied. The effects of group-velocity mismatch, selfand cross-phase modulation, the thickness of crystal on pulse shape, spectrum distribution and conversion efficiency of third-harmonic pulse have been discussed. The results indicate that group-velocity mismatch reduces the tripling efficiency and broadens the third-harmonic pulse, self-and cross-phase modulation not only reduce the tripling efficiency, but also distort the shape of third-harmonic pulse, the thickness of crystal has great effects on tripling efficiency and pulse width. Furthermore, the appropriate detuned angle can improve the conversion efficiency of tripling field.

关 键 词：群速度延迟 自相位调制 交叉相位调制 失谐角度 飞秒激光 

分 类 号：O437[机械工程—光学工程]