This paper presents an investigation of the modulation instability (MI) of a broad optical beam in biased centro-symmetric two-photon photorefractive media under undepleted pump approximation. From the evolution equation of the perturbation field, we obtain the expression for growth rate of the sidebands. The occurrence of MI has been found to be constrained by the system parameters. The MI gain function, its maximum value, critical frequency andbandwidth have been evaluated in the unstable region.
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