Abstract

We characterize a terahertz (THz) source based on plasma in liquid gallium. The dependence of the emitted THz pulse energy on second-order phase, pump pulse energy, and polarization of the short laser pulse is demonstrated. Our study suggests that the THz emission mechanism is due to the ponderomotive force and is aided by a direct-field driven term. The proposed source and accompanying generation mechanism are studied under a non-relativistic regime (${{1}}{{{0}}^{15}} \lt {\rm{I}} \lt {{1}}{{{0}}^{18}}\;{\rm{W}}/{\rm{cm}}^2$) for forward directed THz under a single pump excitation scheme.

© 2021 Optical Society of America

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