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Study of stimulated Brillouin scattering in extended paraxial region

Published online by Cambridge University Press:  22 March 2012

Prerana Sharma ,
A.K. Bhardwaj  and
R.P. Sharma
Prerana Sharma*
Affiliation:
Physics Department, Ujjain Engineering College, Ujjain, India
A.K. Bhardwaj
Affiliation:
N. S. C. B. Government Post Graduate College, Biaora, India
R.P. Sharma
Affiliation:
Centre for Energy Studies, IIT, New Delhi, India
*
Address correspondence and reprint requests to: Prerana Sharma, Physics Department, Ujjain Engineering College, Ujjain, M. P. 465010, India. E-mail: [email protected]
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Abstract

This communication presents a comparison of two cases to study the process of laser beam propagation and Stimulated Brillouin Scattering (SBS) in laser plasma interaction. These two cases are, with imposing the restriction of paraxial approximation on the laser beam and, relaxing this restriction up to a certain extent. In this work, the study done by Sharma et al. (2009) using paraxial approximation is extended by taking contribution of the off-axial rays in the laser beam profile. The spitted profile of the laser beam is obtained due to uneven focusing of the off-axial rays and its effect on localization of the ion acoustic wave (IAW) has been studied. Including the off-axial part of the laser beam semi-analytical solution of the nonlinear coupled IAW equation has been found and this is examined that off-axial part affects background densities. The nonlinear coupling between the laser beam and IAW is severely affected by modified profile of the laser beam. Further, it is investigated that the SBS is also influenced by this coupling process. Therefore, the reflectivity of SBS has been compared with and without contribution of off-axial rays. A notable change is found in the magnitude of SBS reflectivity in modified-paraxial case in comparison to the paraxial case.

Keywords

Ion acoustic waveOff-axial raysParaxial approximationStimulated Brillouin scattering
Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 2 , June 2012 , pp. 207 - 213
Copyright
Copyright © Cambridge University Press 2012

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