Understanding the physics of terahertz (THz) wave generation from a liquid is imperative for developing liquid THz sources. This Letter reports a unified theoretical model for both one- and two-color laser excitation of THz waves from a liquid, which are believed to be based on completely different physical mechanisms and have usually been considered separately in the previous literature. This model is analyzed by conducting numerical simulations and explained intrinsically from the perspective of particle dynamics. Finally, the theoretical model reproduces experimental data and is proved to be applicable for both the one- and two-color cases.
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