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Ytterbium doped single crystals and bonded materials for high power lasers

Johan Petit 
Abstract : Rare earth doped solid state lasers have several advantages: they are compact, they have a high efficiency and their beam quality is good. The main problem to reach high power is the heat production occurring during laser process. The first part of this thesis reports the study of new high pumping power resistance materials: Yb:GdVO4 and Yb:CaGdAlO4 for instance. In the latter laser host, quasi athermal laser emissions and ultra-short pulses have been obtained. In a second part of the thesis, a new sol-gel bonding technique was studied to realize composite sources with efficient heat dissipation. Using this technique, composites of two identical materials showed the same resistance capacities than those obtained by the diffusion bonding method. Using sol-gel interlayer, composites of two different materials are possible: they are resistant up to 200°C and 15 W of input power. The laser losses at the interface are insignificant and the temperature inside the material decreased of about 40%.
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Submitted on : Thursday, May 11, 2006 - 8:00:00 AM
Last modification on : Thursday, May 11, 2006 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:06:15 PM


  • HAL Id : pastel-00001720, version 1



Johan Petit. Ytterbium doped single crystals and bonded materials for high power lasers. Chemical Sciences. Chimie ParisTech, 2006. English. ⟨pastel-00001720⟩



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