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Les II-VI photoréfractifs dans la bande 0,6 - 1,5 um pour l'enregistrement holographique dynamique

Abstract : Due to their high sensitivity, cadmium telluride and zinc telluride crystals are promising photorefractive materials in the field of real-time holographic recording media. The first semiconductor works in the near infrared region (1,06-1,55 mm) whereas the other one is more adapted to the CCD cameras and to laser diodes (850 nm). In this work, the main stages of cadmium telluride crystals development are considered: growth, characterisations and post-growth processes. The material is grown by the vertical Bridgman-Stockbarger method and is optimised for well-defined applications. Some growth parameters are adjusted. Especially, the effect of an axial magnetic field on the growth is experimented. The electric properties are studied by correlating electron paramagnetic resonance and modulated photocurrent experiments. The density of states is probed by the first method whereas the second one identifies the energy levels. The tellurium antisite as well as a second deep centre are detected. The cutting and polishing processes as well as the electrical breakdown behaviour are studied by use of a polarimetric experiment. The optical technique allows to probe the birefringence induced by stresses or by the local electric field. The research on the ZnTe subject focuses on its growth and doping. The “travelling heater method” growth is optimised. Two codopings that brings resistivity and photorefractivity in the material are defined and validated by appropriate characterisations.
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Submitted on : Friday, December 3, 2004 - 7:15:46 PM
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  • HAL Id : tel-00007635, version 1



David Verstraeten. Les II-VI photoréfractifs dans la bande 0,6 - 1,5 um pour l'enregistrement holographique dynamique. Matériaux. Université Sciences et Technologies - Bordeaux I, 2002. Français. ⟨tel-00007635⟩



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