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Excitation of nonlinear ion acoustic wave and stimulated Brillouin scattering of hollow Gaussian beam in relativistic plasma

Published online by Cambridge University Press:  07 March 2017

P. Sharma
P. Sharma*
Affiliation:
Physics department, Ujjain Engineering College, Ujjain 456010, MP, India
*
Address correspondence and reprint requests to: P. Sharma, Physics department, Ujjain Engineering College, Ujjain 456010, MP, India. E-mail: [email protected]
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Abstract

In the present work, excitation of nonlinear ion acoustic wave (IAW) in collisionless plasma by laser beam having null intensity at the center is examined considering relativistic nonlinearity. The differential equation for beam-width parameter is determined considering relativistic nonlinearity using the paraxial and Wentzel–Kramers–Brillouin approximations by the parabolic equation method. The propagation features of the IAW are found to be modified due to the nonlinearity present in the system. The hollow Gaussian beam (HGB) gets nonlinearly coupled with the seed IAW, results in excitation of nonlinear IAW. The interaction of nonlinear IAW with pump beam demonstrated stimulated Brillouin scattering (SBS) of HGB. It is found that the power of IAW and power of SBS is affected with the order of HGB. The power of IAW and backscattered power of SBS is determined analytically and numerically for various orders of HGB. It is found that the power of IAW and the backscattering is diminished for higher order of HGB.

Keywords

Brillouin scatteringhollow Gaussian beamnonlinear ion acoustic waverelativistic nonlinearity
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 2 , June 2017 , pp. 226 - 233
Copyright
Copyright © Cambridge University Press 2017 

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