Preparing attosecond coherences by strong-field ionization
Preparing attosecond coherences by strong-field ionization
复制标题
通过强场电离制备阿秒相干
DOI：
10.1103/physreva.93.023412
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发表时间：
2016
影响因子：
2.9
通讯作者：
H.J. Wörner
中科院分区：
文献类型：
--
作者：
S. Pabst;M. Lein;H.J. Wörner
强场电离（SFI）已经被证明可以制备具有几个飞秒周期的波包。在这里，我们探讨这种技术是否可以扩展到阿秒时间尺度。我们介绍了一个直观的模型，这是基于子循环SFI率的傅立叶变换，用于预测的带宽的离子状态，可以通过SFI相干制备。相干带宽随电离脉冲中心波长的增大而显著减小，但对电离脉冲强度的敏感性要小得多。多体计算的基础上依赖于时间的组态相互作用单打支持这些结果。通道内的离子相互作用和激光诱导动力学的影响进行了讨论。我们的结果进一步预测，与单周期脉冲相比，多周期飞秒脉冲可以相干地制备亚飞秒波包，具有更高的选择性和通用性，并且对所制备态的相互宇称具有额外的敏感性。
Strong-field ionization (SFI) has been shown to prepare wave packets with few-femtosecond periods. Here, we explore whether this technique can be extended to the attosecond time scale. We introduce an intuitive model, which is based on the Fourier transform of the subcycle SFI rate, for predicting the bandwidth of ionic states that can be coherently prepared by SFI. The coherent bandwidth decreases considerably with increasing central wavelength of the ionizing pulse but it is much less sensitive to its intensity. Many-body calculations based on time-dependent configuration-interaction singles support these results. The influence of channel interactions and laser-induced dynamics within the ion is discussed. Our results further predict that multicycle femtosecond pulses can coherently prepare subfemtosecond wave packets with higher selectivity and versatility compared to single-cycle pulses with an additional sensitivity to the mutual parity of the prepared states.