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Nouveaux concepts pour des lasers de puissance : fibres cristallines dopées Ytterbium et pompage direct de cristaux dopés Néodyme

Abstract : The development of innovative technical solutions in high power laser systems is supported by the increasing number of applications. For their realization, solid-state lasers benefit from considerable progress in the integration and the power scaling of high-brightness laser diodes used as pump sources. Gain medium must guaranty an efficient conversion of pump radiation in laser radiation while also preventing the generation of deleterious thermal phenomena and while limiting effects induced by high peak power. In this thesis, two different concepts were studied in order to overcome the major pitfalls of systems emitting in the near infrared (1 μm). The first part of this work was realized in collaboration with the Laboratoire de Physico-Chimie des Matériaux Luminescents and the company Fibercryst. We have developed and characterized Ytterbium doped crystal fibers elaborated by the micro-pulling down growing technique. This geometry combines the properties of bulk crystals and the advantages of doped fibers. We achieved promising laser performance for the realization of systems of high energy, high average power and high peak power. The second part of this thesis is devoted to studying the concept of direct in-band pumping of Neodymium doped crystals. Thanks to drastic reduction of heating processes inside the laser medium, this solution could allow power scaling of lasers systems based on Neodymium doped gain media.
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Contributor : Damien Sangla <>
Submitted on : Monday, January 18, 2010 - 4:38:33 PM
Last modification on : Friday, October 23, 2020 - 4:55:14 PM
Long-term archiving on: : Thursday, June 17, 2010 - 9:28:20 PM

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  • HAL Id : tel-00448320, version 1

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Damien Sangla. Nouveaux concepts pour des lasers de puissance : fibres cristallines dopées Ytterbium et pompage direct de cristaux dopés Néodyme. Physique Atomique [physics.atom-ph]. Université Claude Bernard - Lyon I, 2009. Français. ⟨tel-00448320⟩

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