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Matériaux dopés Ce3+ et Pr3+ pour laser UV accordable tout-solide : croissance cristalline, spectroscopie dans les états excités, fonctionnement laser

Abstract : This work is devoted to the study of Ce3+ and Pr3+ ions in fluoride or oxide single-crystals for a tunable laser emission in the UV spectral domain based on the 5d - 4f vibronic transition. Laser operation of the Ce3+ ion is studied in LiLuF4 and LiYF4 crystals then other systems doped with Pr3+ or Ce3+ are investigated. After a brief description of the Czochralski technique used for the synthesis of fluoride crystals and a review of their structural and optical properties, the first chapter presents the crystal field effect on the 4f5d energy levels as well as the spectroscopic properties of the interconfigurational 4fn ↑ 4fn-15d1 transitions. The second chapter is devoted to the study of LiLuF4:Ce3+ laser operation as well as gain and loss measurements in LiYF4:Ce3+ and LiLuF4:Ce3+ crystals in order to determine the limiting factors of the laser efficiency in these materials. Numerical simulations are also described so as to calculate the gain and the laser efficiency of these systems. The chapter III deals with the experimental and theoretical study of the Pr3+ ion 4f5d energy levels for a two-step pumping process. An excited state absorption (ESA) set-up allowing to probe the 4f5d levels from 4f2 metastable levels is presented. The spectra recorded by this technique are then interpreted thanks to a theoretical model taking into account the crystal field effect. The chapter IV presents the experimental results concerning the two-step pumping process of the Pr3+ ion in different materials as well as an efficiency evaluation using the measured ESA cross-sections obtained in the chapter III. An efficient Pr3+ - Ce3+ energy transfer is also demonstrated in view of using the Pr3+ ion as a sensitizer for the Ce3+ ion. Finally, this work ends with gain measurements, positive results being obtained in the case of the phosphates YPO4:Ce3+ and LuPO4:Ce3+.
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https://tel.archives-ouvertes.fr/tel-00009736
Contributor : Mathieu Laroche <>
Submitted on : Monday, July 11, 2005 - 6:39:04 PM
Last modification on : Tuesday, February 5, 2019 - 12:12:10 PM

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  • HAL Id : tel-00009736, version 1

Citation

Mathieu Laroche. Matériaux dopés Ce3+ et Pr3+ pour laser UV accordable tout-solide : croissance cristalline, spectroscopie dans les états excités, fonctionnement laser. Physique Atomique [physics.atom-ph]. Université de Caen, 2001. Français. ⟨tel-00009736⟩

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