Abstract
In this paper, the authors have investigated the effect of ultra-intense laser beam filaments on stimulated Raman scattering (SRS) in unmagnetized plasma when relativistic and ponderomotive nonlinearities are operative. First, the filamentary dynamics of laser beam is studied. In these structures, the plasma wave generation and associated SRS process are studied. The effect of filamentation on SRS back reflectivity has been studied in detail. For the typical laser plasma parameters, i.e., laser beam Nd:YAG (λ=1064nm), laser beam radius=15μm, laser power flux=6×1017W∕cm2, electron density=1.9×1019percm3, the SRS reflectivity reduces by a factor 2.5 due to ponderomotive effects.
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