26 March 1998 Z-scan studies of refractive index changes in azo-dye-doped PMMA films
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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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Marc Tremblay, Tigran V. Galstian, Marguerite-M. Denariez-Roberge, and Roger A. Lessard "Z-scan studies of refractive index changes in azo-dye-doped PMMA films", Proc. SPIE 3294, Holographic Materials IV, (26 March 1998); doi: 10.1117/12.304519; https://doi.org/10.1117/12.304519

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