Chirp of the single attosecond pulse generated by a polarization gating (6 pages)
Chirp of the single attosecond pulse generated by a polarization gating (6 pages)
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DOI：
10.1103/physreva.71.023813
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发表时间：
2005-02
影响因子：
2.9
通讯作者：
Zenghu Chang
中科院分区：
文献类型：
--
作者：
Zenghu Chang
通过三维非绝热数值模拟与经典计算的比较，研究了极化门控产生的超连续介质的啁啾。啁啾的来源是电子的能量增益对返回时间的依赖。啁啾为正，其值与使用线偏振激光器时的啁啾值几乎相同。虽然$250\text{\ensuremath{-}}\ mathm {eV}$宽的超连续体对应于一个阿秒脉冲，但脉冲的最短持续时间受到啁啾的限制。通过用Sn滤波器的负群速度色散补偿正啁啾，预测可以产生单个$58\text{\ensuremath{-}}\mathrm{as}$脉冲。
The chirp of the xuv supercontinuum generated by a polarization gating is investigated by comparing three-dimensional nonadiabatic numerical simulations with classical calculations. The origin of the chirp is the dependence of the energy gain by an electron on the return time. The chirp is positive and its value is almost the same as that when a linearly polarized laser is used. Although the $250\text{\ensuremath{-}}\mathrm{eV}$-wide supercontinuum corresponds to a single attosecond pulse, the shortest duration of the pulse is limited by the chirp. By compensating the positive chirp with the negative group velocity dispersion of a Sn filter, it is predicted that a single $58\text{\ensuremath{-}}\mathrm{as}$ pulse can be generated.