Influence of excited states in high-order harmonic generation at intense mid-infrared field

doi:10.1088/1674-1056/adda0d

中国物理B ›› 2025, Vol. 34 ›› Issue (10): 103201-103201.doi: 10.1088/1674-1056/adda0d

所属专题： SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems

Influence of excited states in high-order harmonic generation at intense mid-infrared field

Yan Fang(方言), Da-Wei Tian(田大纬), Yue Cao(曹玥), Xiao-Lei Hao(郝小雷), and Zheng Shu(舒正)†

State Key Laboratory of Quantum Optics Technologies and Devices, Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China

收稿日期:2025-03-27 修回日期:2025-05-12 接受日期:2025-05-19 发布日期:2025-09-29
通讯作者: Zheng Shu E-mail:zheng_shu@sxu.edu.cn
基金资助:
This work was supported by the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi.

Influence of excited states in high-order harmonic generation at intense mid-infrared field

Yan Fang(方言), Da-Wei Tian(田大纬), Yue Cao(曹玥), Xiao-Lei Hao(郝小雷), and Zheng Shu(舒正)†

State Key Laboratory of Quantum Optics Technologies and Devices, Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China

Received:2025-03-27 Revised:2025-05-12 Accepted:2025-05-19 Published:2025-09-29
Contact: Zheng Shu E-mail:zheng_shu@sxu.edu.cn
Supported by:
This work was supported by the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi.

摘要/Abstract

摘要： We present a comprehensive study on the role of various excited states in high-order harmonic generation of hydrogen atoms driven by a long-wavelength (1500 nm) laser field. By numerically solving the time-dependent Schr?dinger equation (TDSE) and performing a time-frequency analysis, we investigate the influence of individual excited states on the harmonic spectrum. Our results reveal that the 2s excited state primarily contributes to the enhancement of high-energy harmonic yields by facilitating long electron trajectories, while the 2p excited state predominantly suppresses harmonic yields in the lower-energy region (20th-50th orders) by altering the contributions of electron trajectories. Our results highlight the critical role of the excited states in the HHG process, even at longer laser wavelengths.

关键词: high-order harmonic generation (HHG), strong-field physics, excited-state effect

Abstract: We present a comprehensive study on the role of various excited states in high-order harmonic generation of hydrogen atoms driven by a long-wavelength (1500 nm) laser field. By numerically solving the time-dependent Schr?dinger equation (TDSE) and performing a time-frequency analysis, we investigate the influence of individual excited states on the harmonic spectrum. Our results reveal that the 2s excited state primarily contributes to the enhancement of high-energy harmonic yields by facilitating long electron trajectories, while the 2p excited state predominantly suppresses harmonic yields in the lower-energy region (20th-50th orders) by altering the contributions of electron trajectories. Our results highlight the critical role of the excited states in the HHG process, even at longer laser wavelengths.

Key words: high-order harmonic generation (HHG), strong-field physics, excited-state effect

中图分类号: (Multiphoton ionization and excitation to highly excited states)

32.80.Rm

42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)

Yan Fang(方言), Da-Wei Tian(田大纬), Yue Cao(曹玥), Xiao-Lei Hao(郝小雷), and Zheng Shu(舒正). Influence of excited states in high-order harmonic generation at intense mid-infrared field[J]. 中国物理B, 2025, 34(10): 103201-103201.

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Influence of excited states in high-order harmonic generation at intense mid-infrared field

Influence of excited states in high-order harmonic generation at intense mid-infrared field

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