外文题目: Attosecond chirp effect on the transient absorption spectrum of laser-dressed helium atom
作者: Zhao, Haiwen; Liu, Candong; Zheng, Yinghui; Zeng, Zhinan; Li, Ruxin
刊名: Opt. Express
年: 2017 卷: 25 期: 7 页： 7707--7718
英文关键词:

DYNAMICS; PULSES; PHASE
英文摘要:
We theoretically investigate the attosecond transient absorption spectrum of helium atom in the presence of an infrared-dressed laser pulse upon scanning their relative delay, with the particular emphasis on the chirp effect of the attosecond pulse. By numerically solving the fully three-dimensional time-dependent Schrdinger equation, we identify the attoscecond chirp can induce the temporal shift of the absorption spectrogram along the delay axis. Additionally, it is found that the extent of the temporal shift is dependent on both the position of the absorption line and the infrared pulse wavelength, which is well confirmed and reproduced by a three-level model. Moreover, we demonstrate that the observed features can be quantitatively explained in terms of the indirect two-photon absorption processes through some virtual states. This effect might provide a way to measure the chirp of attosecond pulse in an all-optical way. (C) 2017 Optical Society of America


文献类型: 期刊论文
正文语种: English
收录类别: SCI
DOI: 10.1364/OE.25.007707


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