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中文摘要：
对由波长为1600nm和800nm两色激光形成组合场驱动氦原子产生的高次谐波进行了研究，通过改变组合场中主要发射高次谐波期间电场的上升沿和下降沿随时间不同的变化率，使电子长路经和短路径发射谐波的特性发生变化，将由此产生的高次谐波进行叠加时可以得到更短的阿秒脉冲，再调节两束激光场的延迟时间，能够有效地实现抑制电子短路径的贡献，从而得到脉宽为33．7as的单个阿秒脉冲．
英文摘要：
We theoretically study the high-order harmonic generation （HHG） of a model He atom exposed to a combined field of 1600 nm and 800 nm laser pulses. The changing of rising rate and falling rate with time for the combined filed during main HHG, can present the different characteristics of high-order harmonic generation from the short electron trajectories and the long electron trajectories. By superimposing several harmonics generated from He atom driven by the combined field, we could obtain shorter attosecond pulses. Fi- nally, by adjusting the time delay between two laser pulses, we can effectively suppress the contribution of the short electron trajectories to HHG, and obtain an isolated attosecond pulse with duration 33.7 as.
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