1.4 μm emission properties and local environments of Tm3+ ions in tellurite glass modified with MoO3

The 1.4 μm emission properties of Tm3+ ions embedded in tellurite glass containing MoO3 have been investigated in an effort to develop non-crystalline materials for ultra broadband optical amplifier. Spectral lineshape and bandwidth of the 1.4 μm emission exhibited a negligible dependence on amount of MoO3, while the measured lifetime of the Tm3+:3H4 state decreased with increase in MoO3 content. Multiphonon relaxation turned out to become stronger with increase in MoO3 amount, which coincided with the further broadened Raman scattering bandwidth of the MoO3-containing tellurite glass. The spectroscopic properties of Tm3+ ions doped in our modified tellurite glasses are discussed in connection with the local structural parameters obtained from Tm L3-edge EXAFS analysis.