Enhanced Raman Scattering of Elliptical Laser Beam in a Collisional Plasma

This paper presents the Enhanced Raman scattering of a elliptical laser beam in a collisional plasma. We have considered the mechanism of non-uniform heating of carriers along the wave-front, which is important in collisional plasma. The nonlinearity arising through non-uniform heating leads to redistribution of carriers, which modifies the background plasma density profile in a direction transverse to pump beam axis. This modification in density effects the incident laser beam, plasma wave and back-scattered beam. Non-linear differential equations for the beam width parameters of pump laser beam, plasma wave and back-scattered beam are set up and solved numerically. Numerical results predict the effect of self-focusing of waves on the back-scattered beam. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim