采用Franz-Nodvik模型，通过模拟计算，系统地分析了啁啾脉冲放大(CPA)过程中抽运光和信号光能量密度以及晶体参量对放大器输出能量和转换效率的影响。将理论模拟与实验结果进行比较，证明了理论分析的有效性。计算结果表明:在啁啾脉冲放大系统中,存在一个抽运光最佳能量密度。合理选择抽运光的能量密度可以有效提高系统的能量转换效率和稳定性，而且还可以大大降低系统对注入信号光能量的要求以及由于信号光能量抖动所造成的输出不稳定性。

Based on the Franz-Nodvik mode, a detailed numerical analysis of the contributions of the fluence of the pumping light and signal light as well as the crystal parameter to the output pulse energy and conversion efficiency is presented. Comparison between the theoretical result and the experimental result shows that the theory is quite valid. The calculation indicates that in the system of chirped pulse amplification, there is an optimum fluence of pumping light. Reasonably choosing the fluence of pump light will not only advance the conversion efficiency effectively, but also remarkably reduce the demand of signal light energy and the output instability caused by the fluctuation of signal light energy.