Abstract
Abstract The 1.4 μm emission properties of Tm 3+ ions embedded in tellurite glass containing MoO 3 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 MoO 3 , while the measured lifetime of the Tm 3+ : 3 H 4 state decreased with increase in MoO 3 content. Multiphonon relaxation turned out to become stronger with increase in MoO 3 amount, which coincided with the further broadened Raman scattering bandwidth of the MoO 3 -containing tellurite glass. The spectroscopic properties of Tm 3+ ions doped in our modified tellurite glasses are discussed in connection with the local structural parameters obtained from Tm L 3 -edge EXAFS analysis.
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