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Third harmonic generation of a nonlinear laser Eigen mode of a self sustained plasma channel

Published online by Cambridge University Press:  01 February 2013

K.K. Magesh Kumar  and
V.K. Tripathi
K.K. Magesh Kumar*
Affiliation:
Physics Department, Indian Institute of Technology Delhi, New Delhi, India
V.K. Tripathi
Affiliation:
Physics Department, Indian Institute of Technology Delhi, New Delhi, India
*
Address correspondence and reprint requests to: K.K. Magesh Kumar, Physics Department, Indian Institute of Technology Delhi, New Delhi-110016, India. E-mail: [email protected]
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Abstract

The third harmonic generation of a self organized nonlinear laser Eigen mode of a two-dimensional plasma channel with complete electron evacuation from the inner region is investigated. The nonlinearities arise through the ponderomotive force and relativistic mass variations, while the ions are taken to be immobile. The second harmonic ponderomotive force produces electron density oscillations that beat with the oscillatory velocity due to the laser Eigen mode to create a nonlinear current, driving the third harmonic. As a0 increases up to the threshold value amin, at which complete electron evacuation begins in the inner region, the third harmonic amplitude rises rapidly. Above the threshold, as a0 increases, the width of the inner region where there is no third harmonic current, increases and third harmonic amplitude rises less rapidly. The conversion efficiency is found to be in reasonable agreement with the experimental results.

Keywords

Eigen modeElectron density oscillationsPonderomotive forceSustained plasma channelThird harmonic generation
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 1 , March 2013 , pp. 163 - 169
Copyright
Copyright © Cambridge University Press 2013

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