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Élaboration de céramiques transparentes fluorées activées à l'ytterbium pour application laser

Philippe Aubry
Abstract : This thesis deals with the elaboration of CaF2:Yb transparent ceramics for achieving new amplifier materials for high-power laser. In this area, laser ceramics are a technological breakthrough in comparison to the other current laser materials: single crystals (scaling problems) and glasses (poor thermal properties). The originality of this work is to focus on fluoride matrices which are very attractive for optical applications with their low phonon energy and wide spectral transparency window. Three routes for the synthesis of Yb-doped CaF2 nanoparticles have been developed: mecanosynthesis, the reverse micelles method and precipitation. After microstructural characterizations of powders, the precipitation was chosen: it is simple and particles meet the morphologic criteria (average size ~ 30 nm, low size dispersion...). Three different ways of sintering have been explored: vacuum sintering, hot pressing and SPS. With SEM observations, a two-step protocol has gradually emerged: a vacuum sintering, followed by a post-HIP or post-SPS treatment to eliminate the residual porosity and achieve the desired transparency.
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Theses
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https://pastel.archives-ouvertes.fr/pastel-00005255
Contributor : Ecole Chimie Paristech <>
Submitted on : Monday, July 5, 2010 - 8:00:00 AM
Last modification on : Monday, July 5, 2010 - 8:00:00 AM
Long-term archiving on: : Thursday, October 7, 2010 - 12:30:28 PM

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  • HAL Id : pastel-00005255, version 1

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Philippe Aubry. Élaboration de céramiques transparentes fluorées activées à l'ytterbium pour application laser. Engineering Sciences [physics]. Chimie ParisTech, 2009. English. ⟨pastel-00005255⟩

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