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Stimulated Brillouin backscattering of a ring-rippled laser beam in collisionless plasma

Published online by Cambridge University Press:  30 June 2015

Gunjan Purohit  and
Priyanka Rawat
Gunjan Purohit*
Affiliation:
Laser Plasma Computational Laboratory, Department of Physics, DAV (PG) College, Dehradun, Uttarakhand-248001, India
Priyanka Rawat
Affiliation:
Laser Plasma Computational Laboratory, Department of Physics, DAV (PG) College, Dehradun, Uttarakhand-248001, India
*
Address correspondence and reprint requests to: Gunjan Purohit, Laser Plasma Computational Laboratory, Department of Physics, DAV (PG) College, Dehradun, Uttarakhand-248001, India. E-mail: [email protected]
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Abstract

The effect of the propagation of a ring-rippled laser beam in the presence of relativistic and ponderomotive non-linearities on the excitation of ion-acoustic wave (IAW) and resulting stimulated Brillouin backscattering in collisionless plasma at relativistic powers is studied. To understand the nature of propagation of the ring ripple-like instability, a paraxial-ray approach has been invoked in which all the relevant parameters correspond to a narrow range around the irradiance maximum of the ring ripple. Modified coupled equations for growth of ring ripple in the plasma, generations of IAW and back-stimulated Brillouin scattering (SBS) are derived from fluid equations. These coupled equations are solved analytically and numerically to study the intensity of ring-rippled laser beam and excited IAW as well as back reflectivity of SBS in the plasma for various established laser and plasma parameters. It is found that the back reflectivity of SBS is enhanced due to the strong coupling between ring-rippled laser beam and the excited IAW. The results also show that the back reflectivity of SBS reduce for higher intensity of the laser beam.

Keywords

Relativistic–ponderomotive non-linearityRing rippleIon-acoustic waveSelf-focusingStimulated Brillouin backscattering
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 3 , September 2015 , pp. 499 - 509
Copyright
Copyright © Cambridge University Press 2015 

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