Ionization instabilities of an electromagnetic wave propagating in a tenuous gas

Citation
Zg. Bian et Tm. Antonsen, Ionization instabilities of an electromagnetic wave propagating in a tenuous gas, PHYS PLASMA, 8(7), 2001, pp. 3183-3194
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
7
Year of publication
2001
Pages
3183 - 3194
Database
ISI
SICI code
1070-664X(200107)8:7<3183:IIOAEW>2.0.ZU;2-A
Abstract
A theory is developed to study the scattering instability that occurs when a laser pulse propagates through and ionizes a gas. The instability is due to the intensity dependence of the ionization rate, which leads to a transv ersely structured free electron density. The instability is convective in t he frame of the laser pulse, but can have a relatively short growth length scaling as L(g)similar tok(0)/k(p)(2), where k(0) is the laser wave number, k(p)(2)=omega (2)(p)/c(2) and omega (p) is the plasma frequency. The most unstable perturbations correspond to a scattering angle for which the trans verse wave number is around the plasma wave number, k(p). The scattered lig ht is frequency upshifted. The comparison between simple analytic theory an d numerical simulation shows good agreement. (C) 2001 American Institute of Physics.