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Etude de matériaux dopés Yb3+ pour une émission laser large bande autour de 1um

Abstract : This thesis is dedicated to the study of Yb3+ doped material for laser applications around 1um. The first purpose of this work was to study bulk crystals doped with Yb3+ ions grown at the CIRIL laboratory to obtain CW as well as short pulses laser sources. In this way, we have decided to focus our attention on CaF2 host doped with Yb3+ which combines the properties of crystals (high thermal conductivity) and of glasses (broad absorption and emission bands). Despite the fact that this matrix had been deeply studied in the past, there was no comprehensive spectroscopic study on CaF2 doped with Yb3+. Consequently, before starting laser experiments, a detailed spectroscopic study at low as well as at high ytterbium doping level was achieved. Therefore, isolated sites and clusters appearing at high Yb concentration have been clearly identified. An experimental and theoretical laser study has then been carried out conducing to remarkable laser results in CW and femtosecond regime, making Yb3+:CaF2 a serious candidate for this kind of laser sources. The second objective of this thesis was the study of an optically integrated laser sources emitting at 980 nm for the realization of pumping sources useful for the telecommunications (to pump erbium amplifiers). In this goal, two studies have been conduced, the first onYb,Ti,Ge:SiO2 waveguides fabricated by Rf magnetron sputtering and the second on Yb3+:CaF2 waveguides fabricated by ionic implantation. Thus, first experimental results have been obtained and a theoretical laser model paves the way to optimize laser emission at 980 nm in such waveguides.
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Submitted on : Wednesday, July 18, 2012 - 1:45:51 AM
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  • HAL Id : tel-00718699, version 1

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Vincent Petit. Etude de matériaux dopés Yb3+ pour une émission laser large bande autour de 1um. Physique Atomique [physics.atom-ph]. Université de Caen, 2006. Français. ⟨tel-00718699⟩

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