Intence source of laser-produced unipolar terahertz pulses

A three-dimensional analytical solution for the near field for a terahertz unipolar pulse based on Maxwell's equations is shown. It is calculated in a transition sample in free space by a laser bunch of relativistic electrons as a result of radiation of a thin foil by a femtosecond laser pulse. The paper shows the theoretical obtaining of unipolar pulses from the Maxwell equations, as well as numerical simulations that confirm the theoretical conclusions. The temporal and spatial characteristics of the system are estimated, and the coefficient of conversion of laser radiation into unipolar terahertz radiation is also obtained.