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Suppression of stimulated Brillouin scattering in laser beam hot spots

Published online by Cambridge University Press:  06 October 2009

R.P. Sharma ,
Prerana Sharma ,
Shivani Rajput  and
A.K. Bhardwaj
R.P. Sharma*
Affiliation:
Centre for Energy Studies, Indian Institute of Technology, New Delhi, India
Prerana Sharma
Affiliation:
Centre for Energy Studies, Indian Institute of Technology, New Delhi, India
Shivani Rajput
Affiliation:
Centre for Energy Studies, Indian Institute of Technology, New Delhi, India
A.K. Bhardwaj
Affiliation:
N.S.C.B. Government Post Graduate College, Biaora, India
*
Address correspondence and reprint requests to: R.P. Sharma, Centre for Energy Studies, Indian Institute of Technology, New Delhi 110 016, India. E-mail: [email protected]
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Abstract

In this article, filamentation of a high power laser beam in hot collisionless plasma is investigated considering the ponderomotive nonlinearity. We have studied the effect of self focusing (filamentation) of the laser beam on the localization of ion acoustic wave (IAW) and on stimulated Brillouin scattering (SBS) process. The nonlinear coupling between the laser beam and IAW results in the modification of the Eigen frequency of IAW; consequently, enhanced Landau damping of IAW and a modified mismatch factor in SBS process occur. Due to enhanced Landau damping, there is a reduction in the intensity of IAW wave, and the SBS process gets suppressed. For the typical laser plasma parameters: the laser power flux = 1016 W/cm2, laser beam radius (r0) = 12 µm, n/ncr = 0.11, and (Te/Ti) = 10, the SBS reflectivity is found to be suppressed approximately by 10%.

Keywords

FilamentationIon acoustic wavesPonderomotive nonlinearityStimulated Brillouin scattering
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 4 , December 2009 , pp. 619 - 627
Copyright
Copyright © Cambridge University Press 2009

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