Correlation of fast electron ejections, terahertz waves, and harmonics emitted from plasma mirrors driven by sub-relativistic ultrashort laser pulse

When an ultrashort laser pulse incidents onto a plasma mirror, there exist fast electron ejections, terahertz (THz) radiation, and harmonic generation simultaneously. We investigated the correlation of these three emission phenomena at a preplasma density gradient scale length of (0.05–1)λ and sub-r...

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Bibliographic Details
Published in:AIP advances 2022-05, Vol.12 (5), p.055002-055002-8
Main Authors: Wang, Xiang-bing, Hu, Guang-yue, Shen, Bai-fei, Tang, Hui-bo, Zhang, Zhi-meng, Gu, Yu-qiu
Format: Article
Language:English
Subjects:
Correlation
Electrons
Emission analysis
Energy absorption
Harmonic generations
Laser beam heating
Lasers
Particle in cell technique
Radiation
Relativistic effects
Terahertz frequencies
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Summary:When an ultrashort laser pulse incidents onto a plasma mirror, there exist fast electron ejections, terahertz (THz) radiation, and harmonic generation simultaneously. We investigated the correlation of these three emission phenomena at a preplasma density gradient scale length of (0.05–1)λ and sub-relativistic laser intensity (a0 = 0.4) via particle-in-cell simulation. It is shown that THz radiation is positively correlated with fast electron ejections. As the gradient scale length increases, both enhance first, reach a maximum at 0.4λ, and then degrade at a longer scale length. Harmonic generation, on the other hand, presents the strongest radiation at a sharp surface of 0.05λ and then decays continuously at a softer gradient, indicating that it has an anti-correlation with the fast electron ejections at first (
ISSN:2158-3226
2158-3226
DOI:10.1063/5.0077354