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17 April 2006 Quest of athermal solid state laser: case of Yb:CaGdAlO4
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Emission of Yb: CALGO is constituted of a broad band lying between 990 nm and 1060 nm with relatively high emission cross section values. Since Yb3+ ions occupy a single crystallographic site, the disorder is related to the surrounding cations presenting different size and cationic charges. Laser experiments were performed on a 2%Yb:CALGO sample with anti-reflection coating using Ti:sapphire pumping at 979 nm. A laser oscillation was obtained in sigma polarization from 1050 to 987.6 nm using non-collinear pumping. Consequently, a quantum defect value as low as 0.8% was obtained. This is one of the smallest values ever reported in the literature. In addition the thermal conductivity values are high (k=6.3 and 6.9 W.m-1.K-1 for the two orientations).
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Johan Petit, Philippe Goldner, Bruno Viana, Julien Didierjean, François Balembois, Frédéric Druon, and Patrick Georges "Quest of athermal solid state laser: case of Yb:CaGdAlO4", Proc. SPIE 6190, Solid State Lasers and Amplifiers II, 619003 (17 April 2006);

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