Croissance et caractérisation de fibres monocristallines de nouveaux matériaux pour microlasers bleus et UV

Abstract : Blue and UV lasers are currently used for many applications as data storage, medicine, micromachining, etc. The frequency conversion by means of non-linear crystals appears as a good solution to obtain coherent light sources from usual solid lasers emitting in the IR, no UV laser effect can be produced in any crystal. In this frame, we studied three materials (K3Li2-xNb5+xO15+2x (KLN), Ca5(BO3)3F (CBF) and Bi2ZnB2O7 (BZBO)) which possess promising non-linear optical properties. In this work, we studied two phase diagrams: K2O-Li2O-Nb2O5 and CaO-B2O3-CaF2 in order to determine and optimize the growth conditions of the corresponding crystals.We showed that µ-PD is a good technique for growing non congruently melting crystals (CBF) and crystals originating from a solid solution (KLN). The obtained single crystal fibres were transparent, homogeneous in composition and had a good crystalline quality. The study of the growth of KLN fibers showed that it is very difficult to obtain crystals oriented along the a axis with the used technique. With regard to CBF, the viscosity of the liquid requires to determine the most appropriate couple pulling rate/capillary diameter to obtain transparent crystals. For BZBO, the yellow-red colour of the obtained fibres is probably a consequence of the presence of another phase richer in bismuth.
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Nader Kozhaya. Croissance et caractérisation de fibres monocristallines de nouveaux matériaux pour microlasers bleus et UV. Autre. Université Paul Verlaine - Metz, 2011. Français. ⟨NNT : 2011METZ040S⟩. ⟨tel-01749104⟩

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