High harmonic generation driven by intense ultrashort laser pulse obliquely impinging laminar grating target surface

High harmonic generation (HHG) by ultrashort intense laser pulse obliquely irradiating a laminar grating-structured target is studied by PIC (particle-in-cell) simulation. For different incident angles of laser pulse, the intense near-surface harmonics is observed due to the strong dependence of har...

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Bibliographic Details
Published in:Physics of plasmas 2017-08, Vol.24 (8)
Main Authors: Wang, Yang, Song, Hai-Ying, Liu, H. Y., Liu, Shi-Bing, Meng, Jian-Qiao, Duan, Yu-Xia
Format: Article
Language:English
Subjects:
Dependence
Dipoles
Equivalence
Harmonic generations
Incidence
Lasers
Particle in cell technique
Plasma physics
Spatial distribution
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Summary:High harmonic generation (HHG) by ultrashort intense laser pulse obliquely irradiating a laminar grating-structured target is studied by PIC (particle-in-cell) simulation. For different incident angles of laser pulse, the intense near-surface harmonics is observed due to the strong dependence of harmonic components on the incident angle. Unlike the case of a normal incidence, the spatial distribution of harmonics is mainly dominated by the oscillation of equivalent electric-dipole (OEED) and spatial modulation factor rather than by the current grating equation. The intensities of harmonic emission are stronger than that in the case of a normal incidence, which is associated with the orientation of equivalent electric-dipole. Furthermore, when the incident angle becomes larger (such as 45 ° − 60 ° ), the near-surface harmonics are all observably restrained.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4997436