Abstract
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.
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