• Xiao Qing Li

      Articles written in Pramana – Journal of Physics

    • Modulation instability of an intense laser beam in an unmagnetized electron–positron–ion plasma

      San Qiu Liu Wei Tang Xiao Qing Li

      More Details Abstract Fulltext PDF

      The modulation instability of an intense circularly polarized laser beam propagating in an unmagnetized, cold electron–positron–ion plasma is investigated. Adopting a generalized Karpman method, a three-dimensional nonlinear equation is shown to govern the laser field. Then the conditions for modulation instability and the temporal growth rate are obtained analytically. In order to compare with the usual electron–ion plasmas, the effect of positron concentration is considered. It is found that the increase in positron-to-electron density ratio shifts the instability region towards higher vertical wave numbers but does not cause displacement along the parallel wave number direction, and the growth rate increases as the positron-to-electron density ratio increases.

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