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Self-focusing of laser beam in collisional plasma and its effect on Second Harmonic generation

Published online by Cambridge University Press:  04 October 2011

Arvinder Singh  and
Keshav Walia
Arvinder Singh*
Affiliation:
Department of Physics, National Institute of Technology Jalandhar, India
Keshav Walia
Affiliation:
Department of Physics, National Institute of Technology Jalandhar, India
*
Address correspondence and reprint requests to: Arvinder Singh, Department of Physics, National Institute of Technology Jalandhar, India. Email: [email protected]
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Abstract

This paper presents an investigation of self-focusing of Gaussian laser beam in collisional plasma and its effect on second harmonic generation. Due to non-uniform heating, collisional non-linearity arises, which leads to redistribution of carriers and hence affects the plasma wave, which in turn affects the second harmonic generation. Effect of the intensity of the laser beam/plasma density on the harmonic yield is studied in detail. We have set up the non-linear differential equations for the beam width parameters of the main beam, plasma wave, second harmonic generation and second harmonic yield by taking full non-linear part of the dielectric constant of collisional plasma with the help of moment theory approach. It is predicted from the analysis that harmonic yield increases/decreases due to increase in the plasma density/intensity of the laser beam respectively.

Keywords

Collisional PlasmaPlasma WaveSecond harmonic generationSelf-focusing
Type
Research Article
Information
Laser and Particle Beams , Volume 29 , Issue 4 , December 2011 , pp. 407 - 414
Copyright
Copyright © Cambridge University Press 2011

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