Tm^<3+>-Ln^<3+> (HO^<3+>、Tb^<3+>、Eu^<3+>)共ドープテルライトガラスのエネルギー移動による発光特性変化

概要

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Generally, it is difficult for 1.4 μm band amplification to form population inversion between the initial ^3H_4 and the terminal ^3F_4 levels in Tm^<3+>, because lifetime of the initial level is shorter than that of the terminal level. Accordingly emission properties and lifetimes of tellurite glasses co-doped with Tm^<3+> and various rare earth ions (Ho^<3+>, Tb^<3+>, Eu^<3+>) were investigated in order to improve the population inversion by co-doping method. These co-doped ions depopulated the terminal level rapidly by energy transfer from the terminal level to the co-doped ion. Especially, for the initial level, Ho^<3+> did not affect the population of the initial level because Ho^<3+> easily cause cross-relaxation. Ho^<3+> had the largest effect on lifetime of the terminal level without decreasing the population of the initial level. Ho^<3+> showed the best performance among three investigated rare earth ions as a co-doped ion.
社団法人日本セラミックス協会の論文
2002-06-01