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Stimulated Brillouin backscattering of filamented hollow Gaussian beams

Published online by Cambridge University Press:  19 September 2013

R.P. Sharma  and
Ram Kishor Singh
R.P. Sharma
Affiliation:
Centre for Energy Studies, IIT Delhi, India
Ram Kishor Singh*
Affiliation:
Centre for Energy Studies, IIT Delhi, India
*
Address correspondence and reprint requests to: Ram Kishor Singh, Centre for Energy Studies, IIT Delhi, India 110016. E-mail: ram007kishor@gmail.com
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Abstract

This paper presents an investigation for excitation of ion acoustic wave and resulting stimulated Brillouin scattering in a collisionless plasma due to presence of a laser beam carrying null intensity at center (hollow Gaussian beam). In presence of ponderomotive nonlinearity, the pump beam get focused and affects the back stimulated Brillouin scattering process. To understand the nature of laser plasma coupling, a paraxial-ray approximation has been invoked for the propagation of the hollow Gaussian beam, ion acoustic wave, and stimulated Brillouin scattering. It is observed from the result that self-focusing and back reflectivity reduces for higher order of hollow Gaussian beam.

Keywords

Hollow Gaussian laser beamIon acoustic wavePonderomotive nonlinearitySelf-focusingStimulated Brillouin scattering
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 4 , December 2013 , pp. 689 - 696
Copyright
Copyright © Cambridge University Press 2013 

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