Abstract
In present communication, Stimulated Brillouin scattering (SBS) of high power beam in unmagnetized plasma is investigated. Relativistic and ponderomotive non-linearities are considered simultaneously. There is generation of scattered wave due to interaction of pump wave with ion-acoustic wave (IAW). Here, nonlinearity in dielectric function of plasma is set up under combined effects of variation in mass of electrons on account of high intense lasers as well as variation in plasma density of electrons as a result of ponderomotive force. As a result of this, there is variation in density profile of plasma in a direction transverse to pump beam axis. Incident wave, IAW and Scattered wave are greatly affected due to variation in plasma density. WKB and paraxial ray approximations are used to set up nonlinear differential equations linked with pump wave, IAW, scattered wave and expression for SBS back-reflectivity. Since, analytical solution is not possible for these equations. So, 4th order Runge-Kutta method is used to solve these equations numerically for studying the variation of beams widths of various waves and SBS back-reflectivity against normalized distance of propagation for established parameters of laser and plasma. Further, SBS back-reflectivity is found to get enhanced due to self-focusing.
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