Highly efficient terahertz radiation from a thin foil irradiated by a high-contrast laser pulse.
Phys Rev E
; 94(3-1): 033206, 2016 Sep.
Article
en En
| MEDLINE
| ID: mdl-27739720
ABSTRACT
Radially polarized intense terahertz (THz) radiation behind a thin foil irradiated by ultrahigh-contrast ultrashort relativistic laser pulse is recorded by a single-shot THz time-domain spectroscopy system. As the thickness of the target is reduced from 30 to 2 µm, the duration of the THz emission increases from 5 to over 20 ps and the radiation energy increases dramatically, reaching â¼10.5mJ per pulse, corresponding to a laser-to-THz radiation energy conversion efficiency of 1.7%. The efficient THz emission can be attributed to reflection (deceleration and acceleration) of the laser-driven hot electrons by the target-rear sheath electric field. The experimental results are consistent with that of a simple model as well as particle-in-cell simulation.
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Base de datos:
MEDLINE
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En
Revista:
Phys Rev E
Año:
2016
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Article