We have systematically studied strong THz radiation from solid targets driven by relativistic femtosecond and picosecond laser pulses. The THz generation is due to coherent transition radiation of relativistic laser-driven electron beams when they pass the solid-vacuum boundary. The THz radiation with pulse energy of >mJ has been observed with picosecond pulses. Such high energy THz pulses can not only trigger various nonlinear dynamics in matter, but also open up a new research field of relativistic THz optics.
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