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Theses

X-ray diffraction and imaging with a coherent beam : application to X-Ray optical elements and crystal exhibiting phase inhomogeneities

Abstract : The exceptional properties of synchrotron light sources have been and increasingly are exploited in very different disciplines, from archaeology to chemistry, from material science to biology, from medicine to physics. Among these properties it is important to mention the high brilliance, continuum spectrum, high degree of polarization, time structure, small source size and divergence of the beam, the last resulting in a high transversal coherence of the produced radiation. This high transversal coherence of the synchrotron sources has permitted the development of new techniques, e.g. phase contrast imaging, X-ray photon correlation spectroscopy and coherent X-ray diffraction imaging (CXDI). The thesis work will consist essentially of three parts. In the first part it will be presented the work done as a member of the X-ray Optics Group of ESRF in the characterization of high quality diamond crystals foreseen as X-ray optical elements. The characterization has been done using different complementary X-ray techniques, such as high resolution diffraction, topography, grazing incidence diffraction, reflectivity and measurements of the coherence preservation using the Talbot effect. In the second part, I will show the result obtained in the study of the temperature behaviours of the domain in periodically poled ferroelectrics crystals. This type of measurements, based on Bragg-Fresnel diffraction, are possible only thanks to the high degree of coherence of the beam In the third part, I will present the results obtained in the characterization of diamonds foreseen for applications other than X-ray optical elements.
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Submitted on : Monday, July 18, 2011 - 3:30:42 PM
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Fabio Masiello. X-ray diffraction and imaging with a coherent beam : application to X-Ray optical elements and crystal exhibiting phase inhomogeneities. Condensed Matter [cond-mat]. Université de Grenoble; Università degli studi (Turin, Italie), 2011. English. ⟨NNT : 2011GRENY020⟩. ⟨tel-00609216⟩

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