The effect of ultra intense laser beam filaments on stimulated Brillouin scattering (SBS) has been investigated in collisionless and unmagnetized plasma when relativistic and ponderomotive nonlinearities are operative. The pump depletion and self-focusing effects of the pump and backscattered laser beams are taken into account in three dimensions within the paraxial ray approximations. It is found that Brillouin back-reflectivity decreases when ponderomotive and relativistic nonlinearities are operative. Integrated reflectivity is found to exhibit a maximum value at optimum SBS gain when the self-focusing effect is taken into account. The SBS back-reflectivity continuously increases with GSBS when the self-focusing effect is excluded. The reflectivity with pump depletion is less than without pump depletion.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Mathematical Physics
- Condensed Matter Physics
- Physics and Astronomy(all)