Near-infrared emission in barium gallo-germanate glasses doped with Pr~(3+) and co-doped with Ce~(3+) and Pr~(3+) for broadband optical amplifiers

摘要

Near-infrared emission in barium gallo-germanate glasses containing rare earth ions for broadband optical amplifiers were studied. Among the rare earths, the trivalent praseodymium and cerium ions were selected as an optically active dopants. In order to examine the spectroscopic properties of these glasses doped with Pr~(3+) and co-doped with Ce~(3+) and Pr~(3+) ions the luminescence spectra were registered. The energy transfer processes between cerium and praseodymium ions in barium gallo-germanate glasses have been also investigated. The intense near-infrared luminescence bands corresponding to characteristic transitions of Pr~(3+) ions in singly and doubly doped glass systems were observed. It has been proved that our glasses exhibit intense 1.5 μm emission originating from ~1D_2 → ~1G_4 transition of Pr~(3+) under direct excitation (445 nm). Moreover, the experimental results indicated that energy transfer between Ce~(3+) and Pr~(3+) is not effective for barium gallo-germanate glasses.