Coherent Diffraction Radiation of Relativistic Terahertz Pulses from a Laser-Driven Microplasma Waveguide
Artikel i vetenskaplig tidskrift, 2019

We propose a method to generate isolated relativistic terahertz (THz) pulses using a high-power laser irradiating a microplasma waveguide (MPW). When the laser pulse enters the MPW, high-charge electron bunches are produced and accelerated to similar to 100 MeV by the transverse magnetic modes. A substantial part of the electron energy is transferred to THz emission through coherent diffraction radiation as the electron bunches exit the MPW. We demonstrate this process with three-dimensional particle-in-cell simulations. The frequency of the radiation is determined by the incident laser duration, and the radiated energy is found to be strongly correlated to the charge of the electron bunches, which can be controlled by the laser intensity and microengineering of the MPW target. Our simulations indicate that 100 mJ level relativistic-intense THz pulses with tunable frequency can be generated at existing laser facilities, and the overall efficiency reaches 1%.

Electron energy levels

Coherent diffraction

Three dimensional particle-in-cell simulations

Författare

Longqing Yi

Chalmers, Fysik, Subatomär fysik och plasmafysik

Tünde Fülöp

Chalmers, Fysik, Subatomär fysik och plasmafysik

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 123 9 094801

Ämneskategorier

Fysik

Fusion, plasma och rymdfysik

DOI

10.1103/PhysRevLett.123.094801

PubMed

31524442

Mer information

Senast uppdaterat

2019-11-04