Singular behavior of light-induced space charge in photorefractive media under an ac field

We show that a photoconductive crystal, placed in a rapidly alternating ac field and exposed to nonuniform light, exhibits singularities of the induce d space charge and discontinuities of the corresponding space-charge field. The singularities appear at the local intensity maxima when the curvature of the intensity profile exceeds a certain (often very low) threshold value . We analyze the characteristic features of the singular ac response and co nsider its possible optical manifestations.