The Er3+/Ce3+co-doped tellurite-based glasses(TeO2-Bi2O3-TiO2)modified with various WO3contents are prepared using conventional melt-quenching technique.The X-ray diffraction(XRD)patterns and Raman spectra of glass samples are measured to investigate the structures.The absorption spectra,the up-conversion emission spectra,the 1.53μm band fluorescence spectra and the lifetime of Er3+:4I13/2level are measured,and the amplification quality factors of Er3+are calculated to evaluate the effect of WO3contents on the 1.53μm band spectroscopic properties.With the introduction of WO3,it is found that the prepared tellurite-based glasses maintain the amorphous structure,while the1.53μm band fluorescence intensity of Er3+is improved evidently,and the fluorescence full width at half maximum(FWHM)is broadened accordingly.In addition,the prepared tellurite-based glass samples have larger bandwidth quality factor than silicate and germanate glasses.The results indicate that the prepared Er3+/Ce3+co-doped tellurite-based glass with a certain amount of WO3is an excellent gain medium applied for the 1.53μm band Er3+-doped fiber amplifier(EDFA).
The high phonon energy oxide of B2O3 is introduced into the Er3+/Ce3+co-doped tellurite-niobium glasses with composition of TeO2-Nb2O5-ZnO-Na2O.The absorption spectra,1.53 μm band fluorescence spectra,fluorescence lifetime and Raman spectra of Er3+in glass samples are measured together with the calculations of Judd-Ofelt spectroscopic parameter,stimulated emission and absorption cross-sections,which evaluate the effect of B2O3 on the 1.53 μm band spectroscopic properties of Er3+.It is shown that the introduction of an appropriate amount of B2O3 can further improve the 1.53 μm band fluorescence intensity through an enhanced phonon-assisted energy transfer(ET) between Er3+/Ce3+ions.The results indicate that the prepared Er3+/Ce3+co-doped tellurite-niobium glass with an appropriate amount of B2O3 is a potential gain medium for the 1.53 μm bandbroad erbium-doped fiber amplifier(EDFA).
