Tm³⁺-doped Ga₂O₃-GeO₂-Bi₂O₃-PbO(PbF₂) Glasses for 1.47-μm Optical Amplifications

We report the spectroscopic properties and thermal stability of Tm³⁺-doped Ga₂O₃-GeO₂-Bi₂O₃-PbO(PbF₂) glasses for 1.47-μm optical amplifications. Effects of PbF₂ doping on the optical properties and thermal stability of Tm³⁺-doped gallate--germanium--bismuth--lead glass are investigated. The measured peak wavelength and full width at half-maximum of the fluorescence are 1465nm and ～ 120nm, respectively. Significant enhancement of the 1.47-μm emission and the lifetime of a ³⁺H₄ level with increasing PbF₂ doping have been observed. The presence of GeO₂ provides two potentials of increasing the thermal stability and shortening the ultraviolet cutoff band of host glasses.