Intense multicycle THz pulse generation from laser-produced nanoplasmas.

Kumar, Manoj; Song, Hyung Seon; Lee, Jaeho; Park, Dohyun; Suk, Hyyong; Hur, Min Sup

We present a novel scheme to obtain robust, narrowband, and tunable THz emission using a nano-dimensional overdense plasma target, irradiated by two counter-propagating detuned laser pulses. So far, no narrowband THz sources with a field strength of GV/m-level have been reported from laser-solid interaction (mostly half-or single-cycle THz pulses with only broadband frequency spectrum). From two- and three-dimensional particle-in-cell simulations, we find that the strong plasma current generated by the beat ponderomotive force in the colliding region, produces beat-frequency radiation in the THz range. Here we report intense THz pulses (f ≃ 30 THz) with an unprecedentedly high peak field strength of 11.9 GV/m and spectral width (Δ f / f ≃ 5.3 %) , which leads to a regime of an extremely bright narrowband THz source of TW/cm 2 , suitable for various ambitious applications.

PONDEROMOTIVE force; LASER pulses; PLASMA currents; RADIATION

Scientific Reports, 2023, Vol 13, Issue 1, p1

2045-2322

Academic Journal

10.1038/s41598-023-31427-9