Abstract
We have shown that the broadband near-IR (NIR) fluorescence recently discovered in Bi-doped glasses is not specific due solely to Bi ions. Glasses doped with different (Bi, Pb) and (Sn, Sb) ions exhibit very similar behavior characterized by four major spectral peaks observed in two-dimensional excitation–emission plots and the lifetime of metastable level of about . Our results challenge the existing models of optical centers in Bi-doped glasses. Point defect optical centers caused by the presence of (Bi, Pb) and (Sn, Sb) ions are proposed for the explanation of NIR emission in these laser materials.
© 2008 Optical Society of America
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