THz radiation from a DARC source via a laser-produced relativistic ionization front

摘要

We report on the demonstration of a dc to ac radiation converter (DARC) source as a THz emitter. THz radiation is generated through the spatiotemporal change in electron plasma density induced by a relativistic ionization front propagating in a ZnSe crystal. The central emission frequency is 1.2 THz with a bandwidth of 0.7 THz [full width at half-maximum (FWHM)]. The central frequency is attributed to production of the electron plasma density of the order of 10~(15)cm~(-3) and is in good agreement with the expected theoretical value.