| SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems |
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Resonance-enhanced high-harmonic generation and attosecond transient absorption spectroscopy of hydrogen atoms |
| Yue Cao(曹玥), Zheng Shu(舒正)†, Da-Wei Tian(田大纬), and Xiao-Lei Hao(郝小雷) |
| State Key Laboratory of Quantum Optics Technologies and Devices, Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China |
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Abstract Using ab initio simulations, we investigate high-harmonic generation in hydrogen atoms driven by a near-infrared (NIR) laser pulse combined with an attosecond extreme-ultraviolet (XUV) pulse. The efficiency of high-harmonic generation is significantly enhanced when the XUV pulse excites atoms from the ground state to an excited p state. Furthermore, by varying the time delay between the two laser pulses, we calculate the attosecond transient absorption spectra of hydrogen atoms based on numerical solutions of the time-dependent Schrödinger equation (TDSE). Combining attosecond transient absorption spectra with high-harmonic spectra provides a powerful approach for revealing laser-induced energy-level shifts and the splitting structure of resonant harmonic emission.
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Received: 29 December 2025
Revised: 16 April 2026
Accepted manuscript online: 27 April 2026
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PACS:
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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33.20.Xx
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(Spectra induced by strong-field or attosecond laser irradiation)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 12304304 and 12274273). |
Corresponding Authors:
Zheng Shu
E-mail: zheng_shu@sxu.edu.cn
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Cite this article:
Yue Cao(曹玥), Zheng Shu(舒正), Da-Wei Tian(田大纬), and Xiao-Lei Hao(郝小雷) Resonance-enhanced high-harmonic generation and attosecond transient absorption spectroscopy of hydrogen atoms 2026 Chin. Phys. B 35 064210
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