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10 November 2003 Spatially resolved Mach-Zehnder interferometry and application to nonlinearity measurements
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Mach-Zehnder interferometric technique for nonlinearity measurements is briefly described. The optical setup is combined to a charge-coupled device image processing and allows to resolve the spatial profile of the complex nonlinear variation index with only one laser shot in the nonlinear material. Our experimental results in chalcogenide glasses clearly demonstrate the existence of an intensity dependent change of the sign in the nonlinear dephasing. It is shown that the nonlinear index coefficient cannot be correctly described with the usual cubic model. A more convenient theory is developed assuming a medium with two-photon nonlinear absorption and both cubic (n2) and quintic (n4) nonlinear index variations. The resulting closed-form expression for the effective nonlinear index allows to extract the cubic and quintic index coefficients.
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Georges Boudebs "Spatially resolved Mach-Zehnder interferometry and application to nonlinearity measurements", Proc. SPIE 5212, Linear and Nonlinear Optics of Organic Materials III, (10 November 2003);

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