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Yb:YAG single crystals were grown by the Czochralski method. Thermal properties like thermal diffusivity, conductivity and expansion of various Yb3+ concentration are studied from 50 to 500 °C. The effects of temperature and Yb3+ concentration on the thermal properties of Yb:YAG crystals are discussed. The deterioration of thermal properties of highly doped Yb:YAG is possibly due to the structural distortion caused by the Yb3+ ions. [Copyright &y& Elsevier]

Cr4+:YbAG (Cr4+:Yb3Al5O12) crystal with a size up to Φ24 mm×30 mm was grown by the Czochralski method. In the absorption spectrum, there are two absorption bands at 939 and 969 nm, respectively, which are suitable for InGaAs diode laser pumping, and there is an absorption band at 1030 nm, which is suitable for passive Q-switched laser output at 1.03 μm. A broad emission spectrum from 970 to 1100 nm was exhibited from 940 nm wavelength pumping. This crystal is promising as a self-Q-switched laser crystal used for compact, efficient, highly stable, passive self-Q-switched thin chip solid-state lasers. [Copyright &y& Elsevier]