为了扩展现有飞秒激光的波段，采用非周期的准位相匹配光学超晶格进行了两束激光的和频研究。光学超晶格的结构由遗传算法根据要求模拟计算得到，在此结构晶体上进行平顶长脉宽激光与飞秒激光和频，可以有效地抑制和频光的脉宽展宽，生成457nm的蓝色飞秒激光。结果表明，该技术提供了一种通过两束不同激光和频产生新波长超短脉冲激光的全新技术方案。

In order to get new femtosecond-laser, an aperiodic poled optical superlattice was employed during the sum-frequency generation process. The optimized structure of the quasi-phase matching optical superlattice was studied by means of the genetic algorithm. Femtosecond blue-light laser at 457nm can be generated through femtosecond pulse mixed with top-hat pump pulse in the aperiodic optical superlattice. The simulation results indicate that this technique give a new scheme for generating a new ultra-short laser through nonlinear frequency conversion.