Modulational instability of short laser pulse in hot magnetized plasma is investigated. Nonlinear propagation equation of laser with finite longitudinal and transverse structure in plasma is obtained. Effect of plasma non-neutrality caused by the ponderomotive force on the modulational instability growth rate is studied. It is shown that increase in the intensity until specific value can increase the growth rate then increase in it causes the decrease in the growth rate because of the exiting of electrons from interactional zone via ponderomotive force. Also, effect of essential parameters such as external magnetic field, state of polarization and pulse length on the instability are investigated.

Keywords: Laser-plasma interactions, Modulational instability, Nonlinear Schrodinger equation

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