Effect of TeO2 addition on thermal stabilities and 2.7 μm emission properties of fluoroaluminate-tellurite glass

- The thermal ability of fluoroaluminate is improved a lot by adding TeO2.
- The structure of fluoroaluminate-tellurite is investigated.
- The change of 2.7 μm emission caused by TeO2 has been investigated.
- The energy transfer mechanism about Er3+: 4I11/2 and 4I13/2 level is discussed.
- The energy transfer rate of Er3+: 4I11/2 and 4I13/2 level is discussed.

2.7 μm Emission from Er3+ doped fluoroaluminate-tellurite glass is reported. The thermal stability, glass-forming ability, and crystallization kinetics of the fluoroaluminate-tellurite glass with different TeO2 contents are investigated. FTIR spectra and Raman spectra are measured, at the same time Judd-Ofelt intensity parameters are computed to estimate the structural changes due to the addition of TeO2. The 2.7 μm emission characteristics and energy transfer process upon excitation of a conventional 980 nm LD are studied. Based on the absorption spectra, the Judd-Ofelt parameters and radiative properties are calculated and compared with those of other glass hosts. The prepared glass possesses high predicted spontaneous transition probability and large calculated emission cross section. Besides, the energy transfer microscopic parameter of 4I11/2 level and 4I13/2 level was quantitatively analyzed. Hence, these results indicate that this Er3+ doped fluoroaluminate-tellurite glass has potential applications in 2.7 μm laser.