Terahertz emission at a p-polarized laser radiation action on plasma

Abstract

Terahertz (THz) pulse emission is theoretically investigated when a p-polarized laser radiation falls on semi-bounded plasma. A significant increase in the energy of terahertz radiation is predicted when a laser pulse is incident at the angle of total reflection on the plasma with a density less than the critical value. It is shown that the THz signal amplification becomes especially strong when the ultra-short laser pulse falls at a small angle on the near critical plasma under conditions of rare electron collisions.