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Thermomechanical properties of Yb3+ doped laser crystals: Experiments and modeling

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5 Author(s)
Petit, Johan ; Laboratoire de Chimie de la Matière Condensée de Paris, Chimie ParisTech, 11, rue P et M Curie, 75231 Paris Cedex 05, France ; Viana, Bruno ; Goldner, Philippe ; Roger, Jean-Paul
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Thermal conductivity values of several laser materials were determined by photothermal measurements and compared to predicted values. The effect of the ytterbium doping concentration could be modeled using a simple cationic mass difference model. For ytterbium content corresponding to an absorption coefficient of 10 cm-1 (or 85% absorption of the pump power) Yb:GdVO4 (c-axis) and Yb:Gd3Ga5O12 laser materials present the highest measured thermal conductivity values of 8.1 Wm-1K-1 and 7.7 Wm-1K-1, respectively. Yb:Y3Al5O12, Yb:Lu3Al5O12, Yb:CaGdAlO4, and Yb:YAlO3 belong to the 6–7 Wm-1K-1 range while Yb:CaF2 and Yb:Lu2SiO5 are situated in the 5–6 Wm-1K-1 range. Other matrices such as Yb:SrLaGa3O7, Yb:CaGdAl3O7, Yb:SrGdGa3O7, and Yb:BaLaGa3O7 have thermal conductivity values lower than 5 Wm-1K-1. With the knowledge of the thermal conductivities and the determination of the thermal expansion coefficients, thermal shock parameters are evaluated for several ytterbium doped laser hosts.

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Journal of Applied Physics  (Volume:108 ,  Issue: 12 )