使用I类非共线相位匹配结构，建立三维空间和时间的数值计算模型，优化设计了一个焦耳级光参量啁啾脉冲放大（OPCPA）系统。该系统主要由两级三硼酸锂(LBO)预放大器和一级三硼酸钙氧钇(YCOB)功率放大器组成。通过将抽运光的时空波形整形成超高斯形状、使用走离补偿结构、仔细分析及选取各级参量放大器的长度等措施，保证了最后输出信号光的能量稳定性，同时还获得了较高的能量转换效率和好的光束质量。理论设计结果表明，该系统的各项参数均满足神光Ⅱ九路前端的技术指标要求，是一个具有可行性的设计方案。

Using a three-dimensional spatial and temporal numerical model, optimization design of 1 J-level optical parametric chirped-pulse amplification system with type I noncollinear phase matching structure is discussed. With the two LiB3O5(LBO) preamplifiers and one YCa4O(BO3)3(YCOB) power amplifier, highly stable, high-conversion-efficiency and good beam quality signal output is got by shaping the pump beam′s spatiotemporal profiles to super-Gaussian shapes, using the walk-off compensation structure and choosing the crystal′s length on each stage. This design can meet the requirement of SG-Ⅱ upgrade project′s front-end.