不同含氘量DKDP晶体参量匹配与放大啁啾脉冲压缩特性分析  

Analysis on Phase Matching and Compression of Amplified Chirped Pulse for Various Deuteration Level DKDP Crystals

作　　者：孙美智[1] 康俊[1] 张艳丽[1] 谢兴龙[1] 朱健强[1] 林尊琪[1] 

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800

出　　处：《光学学报》2015年第12期220-227,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11304332;61205210)

摘　　要：针对在808 nm波段的光参量放大系统(OPA),详细分析了氘化磷酸二氢钾(DKDP)晶体非共线相位匹配的非线性过程。通过数值计算,给出了不同氘化率的DKDP晶体参量匹配特性以及匹配参数;在此基础上,利用OPA耦合波方程组分析了基于氘化率为95%的DKDP晶体的光参量啁啾脉冲放大器(OPCPA)的输出特性。结果显示,对大于30 fs压缩脉宽的超短脉冲激光系统,氘化率为90%以上的DKDP晶体具有足够的增益带宽与能量提取效率,但接收角较小,增加了工程调节难度。The non-collinear phase-matching of 808 nm centered optical parametric amplification（OPA） is analyzed in detail in potassium dideuterium phosphate（DKDP） crystal. Phase-matching parameters for various deuteration DKDP crystals are calculated based on the concepts. Optical parametric chirped pulse amplifier（OPCPA） based on 95% deuteration DKDP crystal is designed and the output characteristics are simulated by OPA coupled wave equations for further discuss. It is concluded that DKDP crystals higher than 90% deuteration level can be utilized in ultra-short high power laser systems with compressed pulses broader than 30 fs. The disadvantage is that the acceptance angles are small, increasing the difficulty of engineering regulation.

关 键 词：非线性光学 光参量啁啾脉冲放大 非共线相位匹配 超宽带 氘化磷酸二氢钾 

分 类 号：O437.3[机械工程—光学工程] TN242[理学—光学]