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Crystal growth and thermal conductivity of an Tm3+-doped Y2O3 for IR eye-safe laser
J. H. Mun,A. Jouini,A. Novoselov,A. Yoshikawa,T. Fukuda 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.2
Refractory undoped and Tm3+-doped (0.15, 1, 3 and 5 mol.%) Y2O3 single crystals were grown by the micro-pulling-down method. Chemical analysis showed a homogeneous distribution of Tm3+ dopant along the crystal rod. The dependence of thermal conductivity on Tm3+ concentration in Tm3+ : Y2O3 was characterized. The value decreases when the Tm3+concentration increases in the host but still stays high enough (7.46Wm−1K−1) when doped with Tm3+ (5 mol.%), which represents a promising material for an infrared eye-safe laser application.
J. H. Mun,A. Jouini,A. Yoshikawa,Lyon1 University,T. Fukuda,J. S. Lee 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.5
Undoped and (0, 0.5, 5 mol%) Lu2O3 single crystals were grown by the micro-pulling-down method. Crystals were transparent with yellowish color with 4.2 mm in diameter and 6-9 mm in length. Yb-doped Lu2O3 single crystals have a good compositional homogeneity along the growth axis. Both, thermal diffusivity and heat capacity decrease when the Yb concentration increase. As a result, the calculated thermal conductivity for 5 mol% Yb3+-doped Lu2O3 decreases from 14.32 to 12.42 Wm−1 K−1 . We have also investigated the absorption, fluorescence spectra and measured fluorescence lifetimes as a function of the Yb content.
I. C. Robin,A. Jouini,C. Tavares,J. Rothman,G. Feuillet,D. Ehrentraut,T. Fukuda 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Homoepitaxial layers grown by liquid phase epitaxy on hydrothermally grown ZnO bulk wafers are studied by means of temperature-dependent photoluminescence. The properties of the films are compared to those of hydrothermal ZnO substrates. The effect of Ga doping is studied. Liquid phase epitaxy is shown to be a promising method for achieving substantial variations of the electrical and the luminescent properties of ZnO.