Élaboration et caractérisation de fibres cristallines de nouveaux matériaux pour la conversion de fréquence dans le domaine V-UV par la technique micro-pulling down

Abstract : The growing interest in compact all-solid state laser sources based on non-linear optical crystals emitting in the UV range is explained by their numerous applications such as photolithography, marking, micromachining, cutting or surgery. The only way to generate an ultraviolet laser light from an oxide crystal is by frequency conversion of a near-infrared source. In these conditions, the research works focus towards borate crystals due to their performance, transparency and resistance to laser damage. In this context, we have studied three borate materials: Bi2ZnB2O7 (BZBO), LaBGeO5 (LBGO) and BaCaBO3F (BCBF). Several BZBO crystal fibers were pulled under different conditions by micro-pulling down technique, in order to solve the problem of the orange-red color of the obtained fibers in previous works. The direct growth of LBGO fibers from the melt is impossible because of its excessive viscosity. It was then necessary to find a flux to reduce viscosity and provide crystals with good quality and usable dimensions. So, the LBGO-LiF phase diagram was studied and also the isoplethal section La2O3- LaBGeO5 in the La2O3-B2O3-GeO2 ternary system to examine the possibility of "self-flux". The growth of BCBF fiber being very difficult, the micro-pulling down technique is not appropriate, in its present version, for the growth of this material
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Farah Assi. Élaboration et caractérisation de fibres cristallines de nouveaux matériaux pour la conversion de fréquence dans le domaine V-UV par la technique micro-pulling down. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0194⟩. ⟨tel-01754451⟩

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