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Brillouin-shifted third-harmonic backscattering of laser in a magnetized plasma

Published online by Cambridge University Press:  23 January 2015

Alireza Paknezhad
Alireza Paknezhad*
Affiliation:
Department of Physics, Shabestar Branch, Islamic Azad University, Shabestar, Iran
*
Address correspondence and reprint requests to: Alireza Paknezhad, Department of Physics, Shabestar Branch, Islamic Azad University, Shabestar, postal code: 5381651111, Iran. E-mail: [email protected]
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Abstract

Third-harmonic Brillouin backscattering (3HBBS) instability is investigated in the interaction of a picosecond extraordinary laser pulse with a homogeneous transversely magnetized underdense plasma. Nonlinear coupled equations that describe the instability are derived and solved for a weakly coupled regime to find the maximum growth rate. The nonlinearity arises through the combined effect of relativistic mass increase, static magnetic field, and ponderomotive acceleration of plasma electrons. The growth rate is found to decrease as the static magnetic field increases. It also increases by increasing both plasma density and laser intensity. It is also established that the growth rate of 3HBBS instability in a magnetized plasma is lower than that of fundamental Brillouin backscattering instability.

Keywords

Growth rateMagnetized underdense plasmaThird-harmonic Brillouin backscattering
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 1 , March 2015 , pp. 97 - 102
Copyright
Copyright © Cambridge University Press 2015 

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