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Etude thermique des cristaux lasers, Réalisation de lasers à fibres monocristallines

Julien Didierjean 1 
1 Laboratoire Charles Fabry de l'Institut d'Optique / Elsa
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Solid-state laser systems are represented in more and more applications of laser light. The evolution of laser diode technology makes possible a significant increase of the output power of those systems. Nevertheless, this increase is mitigated by the poor toughness of the gain media of the lasers. For example, the usual bulk laser crystals are limited by powerful thermal effects. New laser architectures have been designed to bypass those issues, but still nowadays there is no system combining simplicity, high average power and high peak power. The work presented here is divided in two parts. The first goal is to study thermal effects in laser crystals, the second goal is to design a new laser media able to exceed the current power limitations. We designed a thermal characterization bench to measure both the thermal conductivity and the thermo-optical coefficient of laser materials, under pumping and laser conditions. Those measurements don't require any tabulated value coming from the literature. We present some practical applications of this characterization bench. In collaboration with the company Fibercryst, we evolved a new laser concept, the single-crystal-fiber laser. Those fibers combined the geometry of fiber lasers with the structural advantages of crystalline materials. We present the characterization of the single-crystal fibers grown by the micro-pulling-down technique, and their laser results. We show that those laser media are promising to realize laser systems combining high average power and high peak power.
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Submitted on : Wednesday, September 16, 2009 - 11:08:51 AM
Last modification on : Saturday, June 25, 2022 - 11:14:19 AM
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  • HAL Id : tel-00417564, version 1



Julien Didierjean. Etude thermique des cristaux lasers, Réalisation de lasers à fibres monocristallines. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00417564⟩



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