Luminescence from bismuth-germanate glasses and its manipulation through oxidants
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2012
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Winterstein, A.
Manning, S.
Ebendorff-Heidepriem, H.
Wondraczek, L.
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Optical Materials Express, 2012; 2(10):1320-1328
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A.Winterstein, S. Manning, H. Ebendorff-Heidepriem, L. Wondraczek
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Abstract
We report on the luminescence properties of bismuth-germanate glasses in which the speciation of bismuth is controlled via addition of CeO<inf>2</inf> as an oxidant. A glass system with the composition (70.5-x)GeO<inf>2</inf> - 24.5Bi<inf>2</inf>O<inf>3</inf> - 5WO<inf>3</inf>: xCeO<inf>2</inf>, with x = 0...2.0, is analyzed in terms of optical properties and redox states of bismuth and cerium. We show that optical transmission and luminescence in the visible to near-infrared (NIR) spectral range can be adjusted by the ratio of bismuth and cerium. Specifically, ultrabroad NIR luminescence spanning the range of 1000 - 1600 nm can be obtained for x ≤ 0.1. This is of particular interest for application of this type of glass in fiber-optical amplifiers where no additional dopants would be required. © 2012 Optical Society of America.
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© 2012 Optical Society of America