Yb:YAG Laser Crystals with Controlled Doping Distribution

Abstract : Development of high average-power solid state lasers rises up issues never faced before by other laser systems. Amplified Spontaneous Emission (ASE) and Thermal management as well as availability of large size high quality gain media are becoming key limiting factors for further energy increase. Lucia is a high average-power laser chains relying on active mirror concept and trivalent Yb doped YAG crystals/ceramics (Yb:YAG) as a gain medium. As for other similar laser systems, Lucia gain media carries a constant distribution of activator ions. Variable doping distribution offers significant advantages in terms of gain distribution and therefore opens the path to efficient ASE and thermal deleterious effects mitigation. Processing of such gain media is the subject of this thesis. Thanks to several particularities, the Bagdasarov method for crystal growth allowed to obtain several Yb:YAG crystals with controlled gradient of doping distribution with values up to 3 at%/cm. The results are in good accordance with mathematical models. Further simulations of temperature and gain distribution show that even smaller gradients can improve energetic characteristics of Lucia amplifiers up to 30% as well as allow using thinner gain medium by this improving heat evacuation. Large laser Yb:YAG crystals are obtained with diameters up to 90 mm.
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Contributor : Mikayel Arzakantsyan <>
Submitted on : Monday, November 4, 2013 - 2:10:03 PM
Last modification on : Thursday, March 21, 2019 - 2:22:45 PM
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  • HAL Id : pastel-00879616, version 1

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Mikayel Arzakantsyan. Yb:YAG Laser Crystals with Controlled Doping Distribution. Optics [physics.optics]. Ecole Polytechnique X, 2013. English. ⟨pastel-00879616⟩

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