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Higher harmonic generation by self-focused q-Gaussian laser beam in preformed collisionless plasma channel

Published online by Cambridge University Press:  27 October 2014

Arvinder Singh  and
Naveen Gupta
Arvinder Singh*
Affiliation:
Department of Physics, National Institute of Technology Jalandhar, Jalandhar, India
Naveen Gupta
Affiliation:
Department of Physics, National Institute of Technology Jalandhar, Jalandhar, India
*
Address correspondence and reprints request to: Arvinder Singh, Department of Physics, National Institute of Technology Jalandhar, Jalandhar, India. E-mail: [email protected]
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Abstract

This paper presents an investigation of self-focusing of a q-Gaussian laser beam and its effect on harmonic generation in a preformed collisionless parabolic plasma channel. In the presence of a q-Gaussian laser beam, the carriers get redistributed from high field region to low field region on account of ponderomotive force as a result of which a transverse density gradient is produced in the channel which in turn generates plasma wave at pump frequency. Generated plasma wave interacts with the incident laser beam and generate higher harmonics of the incident laser beam. Moment theory has been used to derive differential equation for the spot size of laser beam propagating through the channel. The differential equation so obtained has been solved numerically. The effect of the intensity of laser beam, deviation of intensity distribution of laser beam along its wave front from Gaussian distribution, plasma density and depth of channel on beam width of laser beam and harmonic yield has been investigated. The effect of order of higher harmonic on harmonic yield has been also investigated.

Keywords

Collisionless PlasmaHigher harmonic generationPlasma channelq-Gaussian
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 4 , December 2014 , pp. 621 - 629
Copyright
Copyright © Cambridge University Press 2014 

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