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中文摘要：
提出了由波长为800nm、脉冲宽度为5fs的啁啾激光与半周期脉冲形成组合场,并利用这种组合场驱动一维模型氦原子获得单个阿秒脉冲.通过数值求解一维氦原子的含时薛定谔方程,发现氦原子在组合场驱动下高次谐波谱的截止位置可以扩展到Ip＋21.6Up.对第二平台区域不同范围内高次谐波的叠加都能得到单个阿秒脉冲,最短可达37as,特别是对平台区域的前端进行叠加不仅能够得到较短的单个阿秒脉冲,而且与截止位置附近高次谐波构造的阿秒脉冲相比,强度提高了3个数量级.
英文摘要：
We propose an efficient method to generate an ultrashort attosecond pulse when a model He is exposed to the combination of an intense few-cycle chirped laser pulse and a half cycle pulse.By solving the time-dependent Schrdinger equation numerically,we find that the cut-off energy of the harmonics is extended effectively to Ip＋21.6Up.By superimposing some high-order harmonics in different regions for the second plateau,the obtained pulses are all single attosecond ones.Minimum pulse achieves 37 as.Especially,by superimposing the lower order harmonics of the second plateau,one can obtain single attosecond pulse,and also the intensity of the single pulse is three order of magnitude higher than the attosecond pulse obtained near cut-off of harmonics.
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