Numerical simulation on effect of laser parameters on terahertz radiation

THz radiation excited from the laser-plasma interaction was numerically simulated using a 2D3V PIC code, and the effects of laser parameters on the THz radiation power and frequency were compared with the results of the linear mode conversion theory. The PIC simulation results show that the laser pulse intensity dominates on the THz radiation power; the optimal pulse width for the strongest electrostatic wave with THz radiation is around the plasma wavelength. Meanwhile, there is an optimal focused radius which is around 0.35gp0 for the strongest radiation.