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- Title
High harmonic generation in crystalline silicon irradiated by an intense ultrashort laser pulse.
- Authors
Apostolova, Tzveta; Obreshkov, Boyan
- Abstract
We investigate the high harmonic generation in bulk silicon irradiated by intense near-infrared laser pulses with pulse duration ≤ 100 fs. For peak field strength of the applied laser is below 1 V/Å, the spectral intensity of the emitted harmonics follows the prediction of perturbative nonlinear optics—the frequency comb consists of a series of discrete peaks at odd harmonic orders. For a pulse duration longer than 30 fs and peak laser field strength exceeding 1 V/Å, non-perturbative effects and generation of even order harmonics occur. The appearance of even harmonics is due to optical rectification of the transmitted pulse, which includes weak quasi-DC component with electric field as low as 3 V/ μ m. In the strong coupling regime, when the peak field strength inside vacuum exceeds 1.5 V/Å, the laser creates dense breakdown plasma of electron–hole pairs, which in turn results in severe spectral broadening of the transmitted pulse. The harmonic spectrum superimposes onto a continuous background, the spectral width of individual harmonics is substantially broadened, and their central wavelength undergoes a blue shift that covers the spacing between adjacent harmonic orders.
- Subjects
ULTRASHORT laser pulses; ATTOSECOND pulses; HARMONIC generation; ULTRA-short pulsed lasers; NONLINEAR optics; SOLID-state plasmas; RADIANT intensity; LASER pulses; DENSE plasmas
- Publication
European Physical Journal D (EPJ D), 2021, Vol 75, Issue 10, p1
- ISSN
1434-6060
- Publication type
Article
- DOI
10.1140/epjd/s10053-021-00265-7