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Etude du verre d'oxydes LBG : des propriétés optiques non linéaires au comportement sous haute pression

Abstract : The possibility to induce a second-order non-linearity in glasses was prouved in 1991 on silica glasses, thanks to a thermal poling process. The susceptibility created in this manner remains weak. We have therefore studied another oxydes glass (LBG). We developped experimental set up allowing us to create and to characterize the anisotropy induced by thermal poling in LBG glass. The effects of laser UV nanosecond irradiations with the aim of writing waveguides are also studied. The opportunity to vary locally the refractive index and the structure of the glass, leads us to observe the behaviour of LBG glass under high pressures.
The glass, densified in diamond anvil cell is studied in situ by Raman and X-rays absorption spectroscopies (XAS). We put forward a singular behaviour of this glass under pressure by Raman scattering : hysteresis curves, closed or opened are described, showing a non monotonous Raman shift of a band as a function of pressure. XAS measurements confirmed that a partiel irreversible germanium coordination number occured. If the applied pressure is high enough, structural modifications are permanent and steady at ambient pressure.
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https://tel.archives-ouvertes.fr/tel-00364507
Contributor : Camille Coussa-Simon <>
Submitted on : Tuesday, March 17, 2009 - 11:11:22 AM
Last modification on : Wednesday, November 20, 2019 - 2:55:07 AM
Long-term archiving on: : Thursday, June 30, 2011 - 11:10:00 AM

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  • HAL Id : tel-00364507, version 1

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Camille Coussa-Simon. Etude du verre d'oxydes LBG : des propriétés optiques non linéaires au comportement sous haute pression. Physique [physics]. Université Claude Bernard - Lyon I, 2008. Français. ⟨tel-00364507⟩

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