Abstract
It was found that SnO addition widens the emission spectrum of Bi:GeO2 glass and shifts it in the short-wavelength direction. This emission band overlaps the spectral gap at 1540–1600 nm where no laser action in Bi-activated materials has been obtained yet. The amplifiers covering this gap may be of great interest for telecommunication systems of the next generation. The changes in the spectra and in lifetimes give a reason to assume that a variety of new types of bismuth emission centers are formed in these glasses.
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