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Relativistic self-focusing of super-Gaussian laser beam in plasma with transverse magneticfield

Published online by Cambridge University Press:  18 July 2012

Tarsem Singh Gill ,
Ranju Mahajan ,
Ravinder Kaur  and
Suhail Gupta
Tarsem Singh Gill*
Affiliation:
Department of Physics, Guru Nanak Dev University, Amritsar, India
Ranju Mahajan
Affiliation:
Department of Physics, Guru Nanak Dev University, Amritsar, India
Ravinder Kaur
Affiliation:
Department of Physics, Guru Nanak Dev University, Amritsar, India
Suhail Gupta
Affiliation:
Department of Physics, Guru Nanak Dev University, Amritsar, India
*
Address correspondence and reprint requests to: Tarsem Singh Gill, Department of Physics, Guru Nanak Dev University, Amritsar-143005, India. E-mail: gillsema@yahoo.co.in
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Abstract

This paper presents an investigation of a self-consistent, theoretical model, which explains the ring formation in a super-Gaussian laser beam propagating in plasma with transverse magnetic field, characterized by relativistic nonlinearity. Higher order terms (up to r4) in the expansion of the dielectric function and the eikonal have been taken into account. The condition for the formation of a dark and bright ring has been used to study focusing/defocusing of the beam. It is seen that inclusion of higher order terms does significantly affect the dependence of beam width parameter on the distance of propagation. Self-focusing of super-Gaussian beam is studied at various values of super-Gaussian coefficient, m and magnetic field. Further, we have studied some distinct features of critical power curves for varying values of magnetic field.

Keywords

Relativistic nonlinearitySelf-focusingSelf-trappingSuper-Gaussian beam
Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 3 , September 2012 , pp. 509 - 516
Copyright
Copyright © Cambridge University Press 2012

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References

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