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Polarization effect on the Raman backscattering of an electromagnetic wave propagating through an electron–positron–ion magnetoplasma

The present study is devoted to the investigation of stimulated Raman backscattering of an intense, circularly polarized electromagnetic wave in magnetized electron–positron–ion plasma. The nonlinear dispersion relation as well as the growth rate of instability is achieved. The effects of external magnetic field, fraction of electron–positron pairs, pump frequency and also the kind of polarization on the growth rate is studied. It is shown that an admixture of e–p pairs to the ion–electron plasma modifies the behavior of plasma with respect to the external magnetic field.