Frequency shifts of high-order harmonics from ZnO crystals by chirped laser pulses

doi:10.1088/1674-1056/ada9dc

中国物理B ›› 2025, Vol. 34 ›› Issue (3): 33201-033201.doi: 10.1088/1674-1056/ada9dc

Frequency shifts of high-order harmonics from ZnO crystals by chirped laser pulses

Yu Zhao(赵宇)¹, Xiao-Jin Liu(刘晓瑾)¹, Shuang Wang(王爽)¹, Xiao-Xin Huo(霍晓鑫)², Yun-He Xing(邢云鹤)¹, and Jun Zhang(张军)^1,†

1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 School of Science, Shenyang Ligong University, Shenyang 110159, China

收稿日期:2024-11-13 修回日期:2024-12-30 接受日期:2025-01-14 发布日期:2025-03-15
通讯作者: Jun Zhang E-mail:junzhang@jlu.edu.cn
基金资助:
Project supported by the Natural Science Foundation of Jilin Province of China (Grant No. 20230101014JC) and the National Natural Science Foundation of China (Grant No. 12374265).

Frequency shifts of high-order harmonics from ZnO crystals by chirped laser pulses

Yu Zhao(赵宇)¹, Xiao-Jin Liu(刘晓瑾)¹, Shuang Wang(王爽)¹, Xiao-Xin Huo(霍晓鑫)², Yun-He Xing(邢云鹤)¹, and Jun Zhang(张军)^1,†

1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 School of Science, Shenyang Ligong University, Shenyang 110159, China

Received:2024-11-13 Revised:2024-12-30 Accepted:2025-01-14 Published:2025-03-15
Contact: Jun Zhang E-mail:junzhang@jlu.edu.cn
Supported by:
Project supported by the Natural Science Foundation of Jilin Province of China (Grant No. 20230101014JC) and the National Natural Science Foundation of China (Grant No. 12374265).

摘要/Abstract

摘要： We investigate theoretically the effects of chirped laser pulses on high-order harmonic generation (HHG) from solids. We find that the harmonic spectra display redshifts for the driving laser pulses with negative chirp and blueshifts for those with positive chirp, which is due to the change in the instantaneous frequency of the driving laser for different chirped pulses. The analysis of crystal-momentum-resolved (${\bm k}$-resolved) HHG reveals that the frequency shifts are equal for the harmonics generated by different crystal momentum channels. The frequency shifts in the cutoff region are larger than those in the plateau region. With the increase of the absolute value of the chirp parameters, the frequency shifts of HHG become more significant, leading to the shifts from odd- to even-order harmonics. We also demonstrate that the frequency shifts of harmonic spectra are related to the duration of the chirped laser field, but are insensitive to the laser intensity and dephasing time.

关键词: high-order harmonic generation, ZnO crystal, chirped laser pulse, spectral shift

Abstract: We investigate theoretically the effects of chirped laser pulses on high-order harmonic generation (HHG) from solids. We find that the harmonic spectra display redshifts for the driving laser pulses with negative chirp and blueshifts for those with positive chirp, which is due to the change in the instantaneous frequency of the driving laser for different chirped pulses. The analysis of crystal-momentum-resolved (${\bm k}$-resolved) HHG reveals that the frequency shifts are equal for the harmonics generated by different crystal momentum channels. The frequency shifts in the cutoff region are larger than those in the plateau region. With the increase of the absolute value of the chirp parameters, the frequency shifts of HHG become more significant, leading to the shifts from odd- to even-order harmonics. We also demonstrate that the frequency shifts of harmonic spectra are related to the duration of the chirped laser field, but are insensitive to the laser intensity and dephasing time.

Key words: high-order harmonic generation, ZnO crystal, chirped laser pulse, spectral shift

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) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)

Yu Zhao(赵宇), Xiao-Jin Liu(刘晓瑾), Shuang Wang(王爽), Xiao-Xin Huo(霍晓鑫), Yun-He Xing(邢云鹤), and Jun Zhang(张军). Frequency shifts of high-order harmonics from ZnO crystals by chirped laser pulses[J]. 中国物理B, 2025, 34(3): 33201-033201.

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Frequency shifts of high-order harmonics from ZnO crystals by chirped laser pulses

Frequency shifts of high-order harmonics from ZnO crystals by chirped laser pulses

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