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Parametric excitation of surface plasma waves by stimulated Compton scattering of laser beam at metal-free space interface

Published online by Cambridge University Press:  27 June 2016

D. Goel ,
P. Chauhan ,
A. Varshney  and
V. Sajal
D. Goel
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India
P. Chauhan
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India
A. Varshney
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India
V. Sajal*
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India
*
Address correspondence and reprint requests to: V. Sajal, Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India. E-mail: [email protected]
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Abstract

An obliquely incident high-power laser (ω0, k0z) on the metallic surface can resonantly excite a surface plasma wave (SPW) (ω1, k1z) and a quasi-electrostatic plasma wave (ω, kz) inside the skin layer at the phase-matching conditions of frequency ω1 = ω − ω0 and wave number k1z = kz − k0z. The oscillating electrons in the skin layer couples with the seed SPW and exert non-linear ponderomotive force on electrons at the frequency of quasi-static mode. Density perturbations due to quasi-static mode and ponderomotive force associate with the motion of electrons (due to incident laser) and give rise to a non-linear current by feedback mechanism. At ω/kz ~ vF (where vF is the Fermi velocity of metal) this non-linear current is responsible for the growth of SPW. The maximum growth of the present process (≅1.5 × 1012 s−1) is achieved at incident angle θ = 42° for laser frequency ω0 = 2 × 1015 rad/s. Growth of SPW enhances from 1.62 × 1011 to ≅1.5 × 1012 s−1 as the magnetic field changes from 12 to 24 MG. The excited SPW can be utilized for surface heating and diagnostics purpose.

Keywords

Surface plasma wavesParametric excitationStimulated Compton scattering
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 3 , September 2016 , pp. 467 - 473
Copyright
Copyright © Cambridge University Press 2016 

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