Optically transparent Er3＋/Tm3＋/Yb3＋ tri-doped oxyfluoride tellurite based nano-crystallized glass ceramics with the batching composition of 73TeO2-15ZnO-7ZnF2-3YF3-1.5YbF3-0.3ErF3-0.2TmF3 （mol%） is prepared by a conventional melting quenching and the subsequent heat treatment processes. The sizes of grown nano-crystals in glass matrix appear to be smaller than 100 nm from the scanning electron mi- croscope measurement. Visible up-conversion luminescence of the as melted glass and glass ceramics is investigated. The three-color up-conversion luminescence intensities by 980-nm pumping are increased significantly due to the heat treatment, and the blue intensity increases with a higher magnitude than other wavelengths after heat treatment.
The method of conventional glass melting is used to study the glass formation region of Bi2O3-B2O3-TiO2-La2O3 system. The instrument of Differential Scanning Calorimeter （DSC） is used to research the glass stability. Raman spectra and IR spectra are used to speculate on the structure of glasses. The refractive index of glass is measured by prism coupler. With increase of Bi2O3, the glass stability, the amount of [BiO3] group and boron-oxygen loops decrease, while the content of B-O- bond, refractive index and nonlinear refractive index increase.
Thermal stability and 2μm fluorescence of high and low Al（POa）3 content of fluorophosphate glasses are investigated. Thermal stability of high Al（PO3）3 content of fluorophosphate glass is better than low Al（PO3）3 content of fluorophosphate glass. However, 2.04-μm fluorescence intensity of high Al（PO3）3 content of fluorophosphate glass is only 48.2, lower than low AI（PO3）3 content of fluorophosphate glass. Raman spectroscopy is employed to investigate the difference in thermal stability and 2-μm fluorescence. Moreover, fuorescence peak intensity ratios of 2.04 to 1.81 μm and 2.04 to 1.57μm are calculated, which indicate that Er-Tm-Ho doped fluorophosphate glasses are suitable materials in 2μm applications.
