Friday, January 8, 2016

Abstract-Terahertz emission from two-plasmon-decay induced transient currents in laser-solid interactions

We have studied the generation of terahertz (THz) radiation via the interaction of intense femtosecond laser pulses with solid targets at a small incidence angle. It is found that preplasma with a moderate density gradient can enhance the emission. We also observe saturation of the THz output with the driving laser energy. We find that THz emission is closely related to the 3/2 harmonics of the driving laser. Particle-in-cell simulations indicate that under the present experimental conditions, the THz emission could be attributed to the transientcurrents at the plasma-vacuum interface, mainly formed by the two-plasmon-decay instability.

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