High-order harmonic generation of ZnO crystals in chirped and static electric fields

High harmonic generation in ZnO crystals under chirped single-color field and static electric field are investigated by solving the semiconductor Bloch equation (SBE). It is found that when the chirp pulse is introduced, the interference structure becomes obvious while the harmonic cutoff is not ext...

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Bibliographic Details
Published in:Chinese physics B 2024-01, Vol.33 (1), p.13102-376
Main Authors: Zhang, Ling-Yu, He, Yong-Lin, Xie, Zhuo-Xuan, Gao, Fang-Yan, Xu, Qing-Yun, Ge, Xin-Lei, Luo, Xiang-Yi, Guo, Jing
Format: Article
Language:English
Subjects:
four-step semiclassical model
high-order harmonic generation
resolved inter-band harmonic spectrum
the semiconductor Bloch equation
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Summary:High harmonic generation in ZnO crystals under chirped single-color field and static electric field are investigated by solving the semiconductor Bloch equation (SBE). It is found that when the chirp pulse is introduced, the interference structure becomes obvious while the harmonic cutoff is not extended. Furthermore, the harmonic efficiency is improved when the static electric field is included. These phenomena are demonstrated by the classical recollision model in real space affected by the waveform of laser field and inversion symmetry. Specifically, the electron motion in k -space shows that the change of waveform and the destruction of the symmetry of the laser field lead to the incomplete X-structure of the crystal-momentum-resolved ( k -resolved) inter-band harmonic spectrum. Furthermore, a pre-acceleration process in the solid four-step model is confirmed.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/acfa89