Er^3＋-doped phosphor-tellurite glass for broadband short-length Er^3＋-doped fiber amplifier （EDFA） is fabricated and characterized. The differential value （AT） of onset crystalline temperature （Tx） and glass transition temperature （Tg） is 206 ℃. The stimulated emission cross section of Er^3＋ is calculated from absorption 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 luminescence. 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 Ga2O3 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 Ga2O3, fluorescence lifetime, emission cross-section and gain coefficient of yb^3＋-doped gallium-fluorophosphate glasses reach the maximum values at Ga2O3%=8 mol%. The results indicate that yb^3＋-doped gallium-fluorophosphate glasses can be as good candidate for ultra-short pulse lasers.
