The terahertz wave emission at an oblique incidence of the laser pulse on the rarefied plasma

The terahertz wave packet emission theory is constructed when an s-polarized laser pulse is incident on a semi-infinite plasma whose density is much lower than the critical value. The angular, spectral and energy characteristics of a terahertz pulse are studied as a function of the plasma density, the angle of incidence and the duration of laser radiation. It is shown that the energy of the terahertz signal has the maximum value at the fall of the laser pulse at grazing angles, when the effect of total reflection of the laser radiation from the plasma boundary takes place.