Parametric excitation of surface plasma waves over a metallic surface by laser in an external magnetic field

Prashant Chauhan, Deepika Goel, Anshu Varshney, D. B. Singh, Vivek Sajal

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Effects of external static magnetic field (applied in -direction) on resonant excitation of surface plasma waves (SPW) have been investigated over the metal free space interface. The high power laser is incident over the metal surface and exerts a ponderomotive force on the metal electrons in the skin layer. The ponderomotive force disturbs the quasi-neutrality of plasma which results into the excitation of space charge field at the frequency 2ω0. The electron density perturbation at frequency 2ω0 driven by self-consistent space charge potential couples with the oscillatory velocity due to the seed SPW and produces nonlinear current to drive another counter propagating SPW at the phase matching conditions of frequency ω = ω1 - 2ω0 and wavenumber (by feedback mechanism). The parametric process becomes resonant at 2ω0 ≈ ωp and the maximum growth rate is achieved for an incidence angle of laser θ = 40°. The growth rate of the process reduces to half on increasing the magnetic field from 0.49 to 2.45 MG. The present study may be significant to the laser absorption experiments where surface rippling can strongly affect the laser energy absorption.

Original languageEnglish
Pages (from-to)92-97
Number of pages6
JournalLaser and Particle Beams
Volume36
Issue number1
DOIs
StatePublished - 1 Mar 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© Copyright Cambridge University Press 2018.

Keywords

  • Laser
  • magnetic field
  • parametric excitation
  • surface plasma waves

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