提升超短脉冲激光信噪比的啁啾匹配光参变啁啾脉冲放大新方法  

A New Method Using Chirp-Matching OPCPA Scheme for Improving Signal-to-Noise Ratio of Ultrashort Laser Pulse

作　　者：曾曙光[1] 张彬[1] 李现华[1] 孙年春[1] 隋展[2] 

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：《光学学报》2011年第7期198-203,共6页Acta Optica Sinica

基　　金：国家高技术发展计划项目(JG2009039)资助课题

摘　　要：提出了一种利用啁啾匹配光参变啁啾脉冲放大(OPCPA)来提高超短脉冲激光信噪比(SNR)的方法。通过与传统的光参变啁啾脉冲放大方案对比,发现啁啾匹配的光参变啁啾脉冲放大方案可以更好地提高信噪比,同时保持较高的转换效率。利用满足啁啾匹配条件的啁啾参数的计算方法,分析了非线性晶体长度、噪声带宽、抽运啁啾大小以及抽运光信号光同步程度等因素对信噪比提升效果的影响。A method using chirp-matching optical parametric chirped pulse amplification（OPCPA） scheme to improve the signal-to-noise ratio（SNR） of ultrashort laser pulse is proposed.Comparing the chirp-matching OPCPA scheme with the usual OPCPA scheme,it is shown that the chirp-matching OPCPA scheme can improve significantly the SNR of ultrashort laser pulse,and obtain high conversion efficiency simultaneously.The method for determining the chirp parameter which satisfies the chirp-matching condition is presented.The effects of the crystal length,the noise bandwidth,the pump chirp,as well as the synchronization of signal and pump pulses on the improvement of SNR are also analyzed by numerical simulation.

关 键 词：光参变啁啾脉冲放大 啁啾匹配 信噪比 转换效率 

分 类 号：O437.4[机械工程—光学工程]