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Stimulated compton scattering of surface plasma wave excited over metallic surface by a laser

Published online by Cambridge University Press:  23 July 2015

Deepika Goel ,
Prashant Chauhan ,
Anshu Varshney ,
D.B. Singh  and
Vivek Sajal
Deepika Goel
Affiliation:
Department of Physics and Material Science & Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
Prashant Chauhan
Affiliation:
Department of Physics and Material Science & Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
Anshu Varshney
Affiliation:
Department of Physics and Material Science & Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
D.B. Singh
Affiliation:
Laser Science and Technology Center, Delhi, India
Vivek Sajal*
Affiliation:
Department of Physics and Material Science & Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
*
Address correspondence and reprint requests to: Vivek Sajal, Department of Physics and Material Science & Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India. E-mail: vsajal@rediffmail.com
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Abstract

A high-frequency surface plasma wave (SPW) excited over metallic surface irradiated by a laser beam, can undergo stimulated Compton scattering if phase velocity of daughter plasma wave is equal to the Fermi velocity for metal. The pump SPW ${\rm (}{{\rm \omega} _0},{\vec k_{0{\rm z}}})$ parametrically excites a quasi-electrostatic plasma wave ${\rm (\omega}, {\vec k_{\rm z}})$ and a backscattered sideband SPW ${\rm (}{{\rm \omega} _1},{\vec k_{1{\rm z}}})$ at resonance ω0 = ω − ω1 and ${\vec k_{0{\rm z}}} = {\vec k_{\rm z}} - {\vec k_{1{\rm z}}}$. The growth rate of Compton process increases with the frequency of incident laser and turns out to be 5.425 × 1010 rad/s at laser frequency ω0 = 0.7595 × 1015 rad/s for incident laser amplitude A0L = 11 × 1011 V/m, laser spot size b = 1.38 × 10−5 m, and free electron density of metal n0 = 5.85 × 1028/m3. The excitation of highly damped quasi-electrostatic plasma wave in this parametric process provide a better nonlinear option for surface heating as compared with direct laser heating. The process can also be used for diagnostics purposes.

Keywords

Parametric instabilityPlasma-beam interactionsSurface plasma waves
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 4 , December 2015 , pp. 641 - 646
Copyright
Copyright © Cambridge University Press 2015 

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