A. V. Bogatskaya, E. A. Volkova, A. M. Popov, “Plasma channel produced by femtosecond laser pulses as a medium for amplifying electromagnetic radiation of the subterahertz frequency range”, Kvantovaya Elektronika, 2013, Volume 43, Number 12,Pages <nobr>1110

This article is cited in 21 papers

Effect of laser light on matter. Laser plasmas

Plasma channel produced by femtosecond laser pulses as a medium for amplifying electromagnetic radiation of the subterahertz frequency range

A. V. Bogatskaya^ab, E. A. Volkova^a, A. M. Popov^ab

^a Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University
^b Lomonosov Moscow State University, Faculty of Physics

Abstract: The electron energy distribution function in the plasma channel produced by a femtosecond laser pulse with a wavelength of 248 nm in atmospheric-pressure gases was considered. Conditions were determined whereby this channel may be employed for amplifying electromagnetic waves up to the terahertz frequency range over the energy spectrum relaxation time ~10^-7 s. Gains were calculated as functions of time and radiation frequency. The effect of electron – electron collisions on the rate of relaxation processes in the plasma and on its ability to amplify the electromagnetic radiation was investigated.

Keywords: multiphoton ionisation, plasma channel, electromagnetic radiation amplification, electron energy distribution function.

PACS: 32.80.Rm, 52.25.Os, 52.50.Jm

Received: 23.05.2013
Revised: 21.07.2013