通过研究光参量啁啾脉冲放大过程转换效率随泵浦光啁啾参数的变化,以及信号光和泵浦光波长的对应关系, 确立了信号光和泵浦光同步时实现线性啁啾匹配的方法。以磷酸二氢钾作为非线性晶体, 研究了信号光和泵浦光之间的线性啁啾匹配和时间同步抖动对光参量啁啾脉冲放大后信号光脉冲波形和转换效率的影响。结果表明：在时间同步的情况下, 线性啁啾匹配时的信号光脉冲波形很对称, 转换效率也较高;在同步抖动程度一定的情况下, 不同泵浦光啁啾参数时, 信号光的增益及放大后的脉冲波形差异较大;在线性啁啾匹配程度一定时, 信号光和泵浦光时间同步抖动越严重, 放大信号光的脉冲波形变化越大, 信号光增益越小, 且转换效率也越低。

In the process of optical parametric chirped pulse amplification, a chirp matching method for signal-and-pump synchronization has been established by studying the variation of conversion efficiency with pump pulse chirped parameters and the corresponding relationship between signal and pump wavelengths. Taking KDP crystal as the nonlinear crystal, the effects of chirp match and synchronization jitter on the pulse profile and conversion efficiency of optical parametric chirped pulse amplification have been studied. The results indicate that, in the case of time synchronization, the chirp matched pulse profile is considerably symmetrical and the conversion efficiency is high. For a given synchronization jitter, the signal gain and pulse profile after amplification are quite different for different pump pulse chirped parameters. For a given chirp matched parameter, with the greater synchronization jitter, the change of the signal pulse profile after amplification is more obvious, the signal gain is smaller, and the conversion efficiency is lower.