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Attosecond transient absorption spectroscopy: Comparative study based on three-level modeling |
| Zeng-Qiang Yang(杨增强)1, Di-Fa Ye(叶地发)1, Li-Bin Fu(傅立斌)1,2,3 |
1 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
2 CAPT, HEDPS, and IFSA Collaborative Innovation Center of MoE, Peking University, Beijing 100871, China;
3 Center for Fusion Energy Science and Technology, China Academy of Engineering Physics, Beijing 100088, China |
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Abstract In the present paper, the time-resolved transient absorption spectroscopy of helium atoms is investigated based on the three-level modeling. The helium atoms are subjected to an extreme ultraviolet (XUV) attosecond pulse and a time-delayed infrared (IR) few-cycle laser field. The odd excited state are populated from the ground state by the XUV pulse due to the dipole selection rule, and probed by the time-delayed IR laser. The time-resolved transient absorption spectroscopy based on the different coupling mechanism demonstrate some different features, the photoabsorption spectrum based on three-level model with rotating wave approximation (RWA) cannot repeat the fast oscillation and the sideband structure which have been observed in the previous experimental investigation. The dressing effect of IR laser pulse on the ground state can contribute new interference structures in the photoabsorption spectrum.
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Received: 14 June 2017
Revised: 11 October 2017
Accepted manuscript online:
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PACS:
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33.20.Xx
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(Spectra induced by strong-field or attosecond laser irradiation)
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32.30.Jc
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(Visible and ultraviolet spectra)
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32.80.Qk
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(Coherent control of atomic interactions with photons)
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32.80.Wr
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(Other multiphoton processes)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11674034 and 11564033) and the Foundation of President of the China Academy of Engineering Physics (Grant No. 2014-1-029). |
Corresponding Authors:
Zeng-Qiang Yang, Zeng-Qiang Yang
E-mail: yangzq@ymail.com;lbfu@iapcm.ac.cn
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Cite this article:
Zeng-Qiang Yang(杨增强), Di-Fa Ye(叶地发), Li-Bin Fu(傅立斌) Attosecond transient absorption spectroscopy: Comparative study based on three-level modeling 2018 Chin. Phys. B 27 013301
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