Abstract
Erbium-doped glasses showing the widest 1.5 μm emission band are reported in a novel oxide system Bi 2O 3–B 2O 3–SiO 2 and their optical properties such as absorption, emission spectra, cross sections, the Judd–Ofelt parameters and fluorescence lifetime were investigated. The broad and flat 4 I 13/2− 4 I 15/2 emission of Er 3+ ions around 1.5–1.6 μm can be used as an excellent optical amplifier for the wavelength-division-multiplexing (WDM) network system. Among three Judd–Ofelt intensity parameters of Er 3+ ions, the Ω 6 showed very large value in these glasses compared with other oxide and fluoride glasses ever reported. The cross section of the 1.5 μm transition was quite large due to a large refractive index of the host. With increasing B 2O 3 content in the glass composition, the bandwidth increased, while the lifetime of the 4 I 13/2 level decreased. A strong correlation was found between the bandwidth, spontaneous emission probability and the value of the Ω 6 parameter. These optical characteristics were discussed combined with local environment of Er 3+ ions in these novel glasses.
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