Er^(3+)-doped phosphor-tellurite glass for broadband short-length Er^(3+)-doped fiber amplifier(EDFA)is fabricated and characterized.The differential value(△T)of onset crystalline temperature(T_x)and glass transition temperature(T_g)is 206°C.The stimulated emission cross section of Er^(a+)is calculated from ab- sorption spectrum by McCumber theory and is 0.87×10^(-20)cm^2 at 1532 nm.A broad 1.5-μm fluorescence spectrum with 54-nm full-width at half maximum(FWHM)is demonstrated.Especially,the maximum phonon energy of undoped phosphor-tellurite glass is 1100 cm^(-1),which restricts the upconversion lumines- cence.It is possible to pump efficiently at 980 nm.These results indicate Er^(3+)-doped phosphor-tellurite glass is suitable for fabricating broadband short-length EDFA.
Yb^(3+)-doped new gallium-fluorophosphate glasses are prepared,and the influence of Ga_2O_3 on the physical properties,spectroscopic and lasing properties of Yb^(3+)-doped fluorophosphate glasses was studied. The results show that the spectroscopic and lasing properties as well as crystallization stability of Yb^(3+)-doped gallium-fluorophosphate glasses increase with the increasing amount of Ga_2O_3,fluorescence lifetime,emission cross-section and gain coefficient of Yb^(3+)-doped gallium-fluorophosphate glasses reach the maximum values at Ga_2O_3%=8 mol%.The results indicate that Yb^(3+)-doped gallium-fluorophosphate glasses can be as good candidate for ultra-short pulse lasers.
