| The objective of this work was to develop a kind of glass, which may be used as host material for broadband erbium-doped fiber amplifiers. In this thesis, analysis had been made about the relationships of composition, structure and properties within Na2-TeO2-WO3 tellurite glasses system.Glass samples were fabricated by the conventional melt-quenching technique, and characterizing structure and thermal performance of tellurite glasses by XRD, DSC-TG and Raman spectroscopy. The results showed that the glass-forming region within Na2O-TeO2-WO3 tellurite glasses system was determined. And originating from the research comprehensive thermal performance about the system, the composition hasing the best glass-forming abilitiy was found out: 20Na2O · 45TeO2 · 35WO3. The softening point of tellurite glass was at 370℃, which does not make it liable to thermal damage at high optical intensities. The Raman spectra of samples within Na2O-TeO2-WO3 system were reported. Assignments and shifs of Raman spectra had been elucidated reasonably according to micro-structural transformation resulting from the conceivable formation. And the density was between 5.5 to 5.9 g/cm3, the temperature of Littleton softening point was 449℃. Furthermore, studied on structure and thermal performance within two systems: Na2S-TeO2-WO3 and Na2O-TeO2-WO3-Al2O3The spectroscopic properties of tellurite glasses were discussed. Testing the transmittance spectra of glass samples with different Er3+ ion concentration. Absorption spectrum and fluorescent spectrum were measured to determine absorption cross sections, stimulated emission cross sections, FWHM and Ωt (t=2, 4, 6) of Er3+ in tellurite glasses. Fluorescent lifetimes were measured and would decrease when Er3+ ion concentration increases. And the best Er3+ ion concentration was found out: 3mol%. The results indicated that tellurite glass was a promising candidate for a host for broadband erbium-doped fiber amplifiers.
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