Terahertz radiation mechanism in a laser plasma filament

Abstract

Since 1993, the first experiment [1] already shows there are strong terahertz (THz) radiations when an intense laser pulse is focused into gas. More recently, delicate experiments [2] display conical forward THz emission from a femtosecond laser filament, which is explained by a transition-Cherenkov radiation (TKR) model [3]. In fact, there is a long dispute about THz emission mechanism in a laser plasma filament [4].