Abstract
Erbium-doped MoO 3−Bi 2O 3−TeO 2 (MBT) glasses suitable for broadband optical amplifier applications have been fabricated and characterized optically. The maximum phonon band of undoped glasses is at 915 cm −1, and the emission from the Er 3+: 4 I 13/2 → 4 I 15/2 transition locates around 1.53 μm with a full width at half maximum (FWHM) of ∼80 nm. The lifetime and quantum efficiency of the 4 I 13/2 level are 2.13 ms and ∼90%, respectively. Under the same measurement condition, the upconversion emission intensities at 550 nm in Er 3+-doped MBT glasses is about 30 times weaker than that in Er 3+-doped Na 2O−ZnO−TeO 2 (NZT) glasses.
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