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Développement des procédés de mesure de déphasage optique : applications aux non linéarités induites par effet Kerr dans certaines molécules organiques

Abstract : Our study concerns the measurement of the nonlinear (NL) optical phase shift of order three. Two categories of methods will be addressed: i) the phaseshift interferometric technique that allows phase characterization with good spatial resolution, which is crucial for a focused beam in the non-linear medium. This technique uses the least squares criterion associated with several interferograms. Implemented using a spatial light modulator, it provides a practical calibration for each phase shift considered. The reliability of the proposed method is verified by direct comparison with the Fourier transformation method; ii) innovative Z-scan methods combined with an imager assembly. They will be applied here to measurements of the NL coefficients of order three and higher. We will show that the flexibility of using a CCD camera allows for better pointing and real-time tracking of the beam. Finally, we will focus on the Dark-field Z-scan setup, which benefits from the advantages of high contrast dark field microscopy. These improvements potentially open up a new field of microscopic exploration for the investigation and mapping of non-linear effects.
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Christophe Cassagne. Développement des procédés de mesure de déphasage optique : applications aux non linéarités induites par effet Kerr dans certaines molécules organiques. Optique [physics.optics]. Université d'Angers, 2018. Français. ⟨NNT : 2018ANGE0010⟩. ⟨tel-02073581⟩

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