Z-scan studies of refractive index changes in azo-dye-doped PMMA films

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Abstract
We present measurements of complex refractive index changes of new azo dye doped PMMA system, using the so-called Z-scan technique. the photomodulation of the refractive index and absorption coefficients is studied both in steady-state and transient excitation regimes. The saturation intensity in AZD3-PMMA compound is also measured and corresponding corrections are made in obtained Z-scan data. The excitation and relaxation dynamics of the holographic recording are compared with above results. This comparison shows, that the complex refractive index variation (delta) n in AZD3-PMMA is resulted by combination of different excitation modes. However, the (delta) n does not change the sign upon continued exposition. This confirms that the non-monotone growth of holographic diffraction efficiency in this compound is resulted by dynamic saturation of holographic gratings.

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