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Cr4+:Yb3Al5O12 (Cr4+:YbAG) single crystal of high quality has been grown by the Czochralski method. X-ray powder diffraction (XRPD) experiments showed that the Cr4+:YbAG crystal had the same structure as YAG (Y3Al5O12) crystal. The data of thermal expansion and specific heat of the crystal have been measured. The thermal expansion coefficient is α=8.63×10-6/K. The specific heat is 131.8 cal/mol·K at 320.5 K. The results show that Cr4+:YbAG crystal is a promising self-Q-switched laser crystal. [Copyright &y& Elsevier]

Abstract: Highly (0 0 1) orientation LiGaO2 layers have been successfully fabricated on (1 0 0) β-Ga2O3 surface by vapor transport equilibration (VTE) technique. The temperature is very important for the VTE treatment. At low temperature (800°C), LiGaO2layers are textured. As the temperature was raised to 1100°C the layer becomes highly oriented in the [1 0 0] direction. It shows that the best temperature for VTE treatment is 1100°C. This technique is promising to fabricate small lattice mismatch composite substrate of LiGaO2 (0 0 1)a2O3 (100) for GaN films. [Copyright &y& Elsevier]