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The instabilities arising in a one-dimensional beam sustained by thediffusive photorefractive nonlinearity in out-of-equilibrium ferroelectrics aretheoretically and numerically investigated. In the "scale-free model", instriking contrast with the well-known spatial modulational instability, twodifferent beam instabilities dominate: a defocusing and a fragmenting process.Both are independent of the beam power and are not associated to any specificperiodic pattern.

Beam Instabilities in the Scale Free Regime