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The brightness of a light source defines its applicability to nonlinearphenomena in science. Bright low frequency terahertz (< 5THz) radiationconfined to a diffraction-limited spot size is a present hurdle due to thebroad bandwidth and long wavelengths associated with single-cycle terahertzpulses as well as due to the lack of terahertz wavefront correctors. Here,using a present-technology system, we employ a new concept of terahertzwavefront manipulation and focusing optimization. We demonstrate aspatio-temporal confinement of terahertz energy at its physical limits to theleast possible 3-dimensional light bullet volume of lambda cubic. This leads toa new regime of extremely bright terahertz radiation reaching 40 PW/m2intensity. The presented work is focused on the sub-5 THz range using smallaperture organic crystals DSTMS and OH1. The obtained peak field of up to 5GV/m and 17 Tesla is order of magnitude higher than any reported single-cyclefield oscillation in the entire THz range from a laser-based system andsurpassing large scale accelerator systems. The presented results are foreseento have a great impact on future nonlinear terahertz applications in differentscience disciplines.

Terahertz brightness at the extreme: demonstration of 5 GV/m, 17 T low frequency {\lambda}3 terahertz bullet