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Excitation of electron plasma wave by filamented laser beam and third-harmonic generation in magneto plasma

Published online by Cambridge University Press:  14 May 2015

Prerana Sharma
Prerana Sharma*
Affiliation:
Physics Department, Ujjain Engineering College, Ujjain, M. P., India
*
Address correspondence and reprint requests to: Prerana Sharma, Physics Department, Ujjain Engineering College, Ujjain 456010, M. P., India. E-mail: preranaiitd@rediffmail.com
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Abstract

The combined effects of filamentation and magnetic field on the third-harmonic generation of electromagnetic beams have been investigated considering extended paraxial rays in magneto plasma. The analysis is done using eikonal method in which eikonal and other relevant quantities are extended up to fourth power of r. The time scale of laser beam is chosen such that the relativistic mass variation of electron becomes dominated source of nonlinearity in refractive index. The expression for coupling between ultra-intense laser beam and electron plasma wave due to relativistic nonlinearity has been deduced. Interaction of the seed plasma wave with the incident filamented laser beam excites the plasma wave and generates third harmonics. The expressions for plasma wave power and third-harmonic power have been derived. The effect of the magnetic field on the power of plasma wave and the third-harmonic power has been carried out. The role of magnetic field has been found to decrease the power of plasma wave and so as the power of third harmonic. Our results can be helpful for various laser plasma diagnostics experiments in which magnetic field present externally or generated spontaneously in the high-power laser–plasma interaction.

Keywords

FilamentationThird harmonic generationRelativistic nonlinearity
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 3 , September 2015 , pp. 415 - 424
Copyright
Copyright © Cambridge University Press 2015 

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