Spectroscopic study of optical centers formed in Bi-, Pb-, Sb-, Sn-, Te-, and In-doped germanate glasses

摘要

We have shown that the broadband near-IR (NIR) fluorescence recently discovered in Bi-doped glasses is notnspecific due solely to Bi ions. Glasses doped with different 6p (Bi, Pb) and 5p (Sn, Sb) ions exhibit very simi-nlar behavior characterized by four major spectral peaks observed in two-dimensional excitation–emissionnplots and the lifetime of metastable level of about 400 u0001s. Our results challenge the existing models of op-ntical centers in Bi-doped glasses. Point defect optical centers caused by the presence of 6p (Bi, Pb) and 5pn(Sn, Sb) ions are proposed for the explanation of NIR emission in these laser materials. © 2008 Optical So-nciety of America