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Filamentation of laser beam and suppression of stimulated Raman scattering due to localization of electron plasma wave

Published online by Cambridge University Press:  11 October 2011

GUNJAN PUROHIT ,
PRERANA SHARMA  and
R. P. SHARMA
GUNJAN PUROHIT
Affiliation:
Department of Physics, DAV (PG) College, Dehradun, Uttarakhand-248 001, India ([email protected])
PRERANA SHARMA
Affiliation:
NSCB Government Postgraduate College, Biaora, Madhya Pradesh, India
R. P. SHARMA
Affiliation:
Centre for Energy Studies, Indian Institute of Technology, New Delhi-110016, India
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Abstract

This paper presents the effect of laser beam filamentation on the localization of electron plasma wave (EPW) and stimulated Raman scattering (SRS) in unmagnetized plasma when relativistic and ponderomotive nonlinearities are operative. The splitted profile of the laser beam is obtained due to uneven focusing of the off-axial rays. The semi-analytical solution of the nonlinearly coupled EPW equation in the presence of laser beam filaments has been found. It is observed that due to this nonlinear coupling between these two waves, localization of EPW takes place. Stimulated Raman scattering of this EPW is studied and back reflectivity has been calculated. Further, the localization of EPW affects the eigenfrequency and damping of plasma wave. The new enhanced damping of the plasma wave has been calculated and it is found that the SRS process gets suppressed due to the localization of plasma wave in laser beam filamentary structures.

Type
Papers
Information
Journal of Plasma Physics , Volume 78 , Issue 1 , February 2012 , pp. 55 - 63
Copyright
Copyright © Cambridge University Press 2011

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