High Field Broadband THz Pulses by Ultrashort Laser-plasma Interaction

High Field Broadband THz Pulses by Ultrashort Laser-plasma Interaction

The Pacific Rim Conference on Lasers and Electro-Optics (CLEO-Pacific Rim)

Wen Jun Ding, Z. M. Sheng

laser-plasma interaction, THz radiation, coherent transition radiation, hot electrons.

07 May 2021

15. W. J. Ding and Z. M. Sheng, "High Field Broadband THz Pulses by Ultrashort Laser-plasma Interaction", The Pacific Rim Conference on Lasers and Electro-Optics (CLEO-Pacific Rim), Singapore, 3-2H-7 (2017).

Broadband THz radiation with electric field up to hundreds of MV/cm is achieved using femtosecond laser interaction with solid target. Particle-in-cell simulations reveal that the THz pulses are coherent transition radiation (CTR) of hot electrons produced in laser-plasma interaction. Due to the square law dependence of CTR energy on the electron number, laser-plasma based strong THz sources can reach unprecedented intensity comparing to other methods. Besides planar targets, nano-grating targets have also been investigated, which improve the THz sources both in intensity and directionality. Theory model and simulations agree very well with experimental observations

A*STAR SERC Young Individual Research Grants (YIRG No. A1784c0020)

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Institute of High Performance Computing