Abstract

We propose and demonstrate alkali bismuth gallate glasses as suitable hosts for the rare earth praseodymium (Pr3+) operating at 1.3-µm wavelength. The structure of the glasses was investigated by Raman spectroscopy. The optical absorption and the photoluminescence properties of Pr3+ in these glasses were characterized. The Raman spectrum shows two strong peaks, at 134 and 381 cm-1, and a weak peak at 660 cm-1. The results indicate that bismuth (Bi3+) and gallium (Ga3+) cations do take part in the formation of the glass network. The emission from the Pr3+:1G43H5 transition is at 1.34-µm wavelength, and the spectral bandwidth is 120 nm, which is wider than those of fluoride and chalcogenide glasses. The lifetime of the  1G4 level is ∼78 µs, and the quantum efficiency is ∼17.4%, which is higher than that in fluoride glasses.

© 2000 Optical Society of America

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