Abstract

We propose and demonstrate alkali bismuth gallate glasses as suitable hosts for the rare earth praseodymium $({\mathrm{Pr}}^{3+})$ operating at 1.3-µm wavelength. The structure of the glasses was investigated by Raman spectroscopy. The optical absorption and the photoluminescence properties of ${\mathrm{Pr}}^{3+}$ 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 $({\mathrm{Bi}}^{3+})$ and gallium $({\mathrm{Ga}}^{3+})$ cations do take part in the formation of the glass network. The emission from the ${\mathrm{Pr}}^{3+}:{\hspace{0.5em}}^1{G}_4{\to }^3{H}_5$ 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 ${ }^1{G}_4$ 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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