This paper presents the effect of relativistic electron mass variation on a very high-power laser beam propagating in unmagnetized plasma. By choosing the laser beam and plasma parameters, the laser beam could be propagated without convergence or divergence (self-trapped mode). When the laser power exceeds the critical power, the laser beam can undergo periodic self-focusing due to relativistic nonlinearity. The stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) processes in the presence of this relativistic nonlinearity are discussed. The effect of finite laser beam size and that of scattered beam and relativistic self-focusing of the pump laser beam on SRS and SBS back-reflectivity have also been studied, including pump depletion.
ASJC Scopus subject areas
- Condensed Matter Physics