We investigated powerful terahertz (THz) radiation from laser-driven gas plasma by theory and particle-in-cell (PIC) simulation. We proposed a model to describe THz radiation emission from a net current in plasma. We found that the well-known two-color scheme can be extended to the second laser at any even harmonic of the main laser. To strengthen the THz radiation, we proposed mid-infrared laser scheme, picosecond laser scheme, and asymmetric laser scheme. Recently, we proposed an approach to generate tunable, circularly-polarized, narrow-band THz radiation.
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