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Photoinduced birefringence in acceptor-donor azo dye doped in a polymer

Nonresonant photoinduced birefringence of an acceptor-donor azo dye doped in polymethyl methacrylate film was studied by degenerate four-wave mixing and Z-scan methods with a He-Ne laser. The sample has appreciable large third-order nonlinear susceptibility and polarization sensitivity. The nonlinear mechanism of the material originates from photoinduced birefringence of polar azo molecule.