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The production of broadband, terawatt terahertz (THz) pulses has beendemonstrated by irradiating relativistic lasers on solid targets. However, thegeneration of extremely powerful, narrow-band, and frequency-tunable THz pulsesremains a challenge. Here, we present a novel approach for such THz pulses, inwhich a plasma wiggler is elaborated by a table-top laser and a near-criticaldensity plasma. In such a wiggler, the laser-accelerated electrons emit THzradiations with a period closely related to the plasma thickness. Theoreticalmodel and numerical simulations predict a THz pulse with a laser-THz energyconversion over 2.0$\%$, an ultra-strong field exceeding 80 GV/m, a divergenceangle approximately 20$^\circ$, and a center-frequency tunable from 4.4 to 1.5THz, can be generated from a laser of 430 mJ. Furthermore, we demonstrate thatthis method can work across a wide range of laser and plasma parameters,offering potential for future applications with extremely powerful THz pulse.

Extremely powerful and frequency-tunable terahertz pulses from a table-top laser-plasma wiggler