arXiv 0709.27442007-09-18physics.atom-phphysics.optics

单周期阿秒脉冲的有效产生

Efficient generation of an isolated single-cycle attosecond pulse

Pengfei Lan, Peixiang Lu, Wei Cao, Xinlin Wang

备注：: 5 pages, 4 figures
DOI：: 10.1103/PhysRevA.76.043808

摘要：

提出了一种有效产生单周期阿秒脉冲的新方法。结果表明，紫外阿秒脉冲可以作为控制电子波包（EWP）动力学的有力工具。通过在适当的时间将紫外阿秒脉冲加到红外几个周期脉冲上，只选择一个返回到母离子的EWP来有效地贡献谐波，获得了带宽为45 eV的隔离的两个周期的130-As脉冲。在对啁啾进行补偿后，获得了持续时间小于100的单周期阿秒脉冲。此外，量子轨迹的贡献可以通过调整IR和UV场之间的延迟来选择。与[G. Sansone { \it等}，Science { \bf 314}，443（2006）]中使用几个周期的IR脉冲结合偏振选通技术。

英文摘要：

A new method for efficiently generating an isolated single-cycle attosecond pulse is proposed. It is shown that the ultraviolet (UV) attosecond pulse can be utilized as a robust tool to control the dynamics of electron wave packets (EWPs). By adding a UV attosecond pulse to an infrared (IR) few-cycle pulse at a proper time, only one return of the EWP to the parent ion is selected to effectively contribute to the harmonics, then an isolated two-cycle 130-as pulse with a bandwidth of 45 eV is obtained. After complementing the chirp, an isolated single-cycle attosecond pulse with a duration less than 100 as seems achievable. In addition, the contribution of the quantum trajectories can be selected by adjusting the delay between the IR and UV fields. Using this method, the harmonic and attosecond pulse yields are efficiently enhanced in contrast to the scheme [G. Sansone {\it et al.}, Science {\bf314}, 443 (2006)] using a few-cycle IR pulse in combination with the polarization gating technique.

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