Two-Color fs-Laser-Induced Microplasmas: From Point-Like THz Sources to Forward Emission
Résumé
We investigate THz radiation from a two-color fs-laser-induced microplasma acting as a point like emitter that is polarized as the second harmonic laser field. The transition to forward emission is analyzed by enlarging the plasma size, leading to conversion efficiencies above 10−4 for 10-µJ pulses.