光参量啁啾脉冲放大的逆问题

针对光参量啁啾脉冲放大的逆问题，即如何在给定输出信号光脉冲波形的前提下，通过计算得到输入信号光脉冲波形，提出了相应的计算模型和方法.以分步傅里叶变换和四阶龙格-库塔法为基础，通过数值拟合等方法，建立了输入-输出信号光强之间的定量关系.分别以预期输出信号光脉冲为啁啾高斯脉冲以及具有特定形状的整形脉冲为例，通过逆算得到了相应的输入信号光脉冲波形.研究结果表明，该逆算方法具有原理简单、计算快速准确等优点，可为激光脉冲整形设计提供参考. 关键词： 光参量啁啾脉冲放大 逆问题 啁啾脉冲 脉冲整形

Inverse problem of optical parametric chirped pulse amplification

A method for solving the inverse problem of optical parametric chirped pulse amplification, i.e., for a given shape of the output signal pulse, how to calculate the shape of the input signal pulse, is proposed. Based on numerical techniques such as split-step Fourier transform and fourth-order Runge-Kutta, the quantitative relation between the input signal intensity and the output signal intensity was obtained by numerical fitting. Taking the chirped Gaussian pulse and the shaping pulse with a certain shape as the required output signal pulse, the input signal pulse shape can be worked out by the inverse calculation. The results indicate that the inverse problem can be solved quickly and precisely with the method proposed in this paper, and this method is useful for pulse shaping.