Abstract

We present a theoretical analysis of the recently discovered optical domain-wall solitons. We discuss the fundamental link which exists between diffractive spatial domain-wall solitons and the instability responsible for the self-filamentation of polarized laser beams in self-defocusing Kerr media. We show that the vector properties of the third-order nonlinear response of atomic vapors satisfy the conditions of occurrence of this instability and are therefore suited to the experimental observation of the spatial polarization domain-wall solitons.

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