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) via the interaction of intense 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. indicate that under the present experimental conditions, the THz emission could be attributed to the transient at the plasma-vacuum interface, mainly formed by the two-plasmon-decay instability.