fa Effect of Positive and Negative Dust Grains on the Modulational Instability of Laser Propagating through Hot Magnetized Plasma تخصصی Special پژوهشي Research The present study is aimed to investigate the problem of modulation instability of an intense laser beam in the hot magnetized dusty plasma. The nonlinear propagation of intense circularly-polarized laser beam along the external magnetic field is considered using a relativistic fluid model in the quasi-neutral approximation, which is valid for hot plasma. Nonlinear dispersion equation is obtained. For left- and right-hand polarizations, the growth rate of modulation instability is achieved and the effect of external magnetic field, negative and positive dust grains and kind of polarization on the growth rate is considered. The present study is aimed to investigate the problem of modulation instability of an intense laser beam in the hot magnetized dusty plasma. The nonlinear propagation of intense circularly-polarized laser beam along the external magnetic field is considered using a relativistic fluid model in the quasi-neutral approximation, which is valid for hot plasma. Nonlinear dispersion equation is obtained. For left- and right-hand polarizations, the growth rate of modulation instability is achieved and the effect of external magnetic field, negative and positive dust grains and kind of polarization on the growth rate is considered. plasma, Laser interaction, Modulational instability, Nonlinear Schrodinger equation, quasi-neutral plasma, Laser interaction, Modulational instability, Nonlinear Schrodinger equation, quasi-neutral 1635 1638 http://opsi.ir/browse.php?a_code=A-10-1-800&slc_lang=fa&sid=1 Nasser Sepehri Javan Nasser Sepehri Javan nsj108119@yahoo.com 10031947532846003796 10031947532846003796 Yes Mohaghegh Ardabili University Mohaghegh Ardabili University Masoume Judi Masoume Judi masoum.judi@gmail.com 10031947532846003797 10031947532846003797 No Islamic Azad University, Sciences and Research branch of Ardabil Islamic Azad University, Sciences and Research branch of Ardabil