Etude des propriétés électro-optiques des cristaux de niobate de lithium en fonction de leur composition et de leur dopage par des ions chrome

Abstract : Lithium niobate (LiNbO3, LN) is a material used in many acousto and optoelectronic devices thanks to its piezo-electric, electro-optic (EO) and nonlinear optical properties. Recently, new techniques of preparation allowed the achievement of crystals with different compositions. The possibility of preparing stoichiometric samples renewed the interest on studying the basic properties of this material. This study is devoted to the determination and the analyisi of the EO properties of several crystals of LiNbO3 : pure crystals with different compositions (concentration of intrinsic defects) and chromium-doped crystals with different initial compositions. We have determined the compostion of the pure crystals by different analysis techniques calibrated with standard crystals. We have also used the same techniques to determine the composition od doped-crystal by discussing the limit of validity of these methods. We have determined the EO properties of the different samples by using a very sensitive method based on the Sénarmont type compensating arrangement. The behaviour of the EO and dielectric properties are compared as a function of frequency of the applied electric field, composition and doping of the samples. Microscopic analysis of intrinsic defects structure and the dynamic site of substitution for Cr3+ ions in LN matrix, based on the luminescence results, allowed us to interpret the variation of the effective EO rc coefficient in pure and Cr-doped crystals
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Karima Chah. Etude des propriétés électro-optiques des cristaux de niobate de lithium en fonction de leur composition et de leur dopage par des ions chrome. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 1997. Français. ⟨NNT : 1997METZ058S⟩. ⟨tel-01777235⟩

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