Fluorescence lifetime increase by introduction of F- ions in ytterbium-doped TeO2-based glasses

this paper was retracted

The effects of F- ions in zinc-tungsten-tellurite glass system on the spectral and potential laser properties of the Yb3+ are investigated. The absorption spectra, lifetimes, the emission cross-sections and the minimum pump intensities of the glass system with and without F- ions have been measured and calculated, respectively. The results show that the fluorescence lifetime and the minimum pump intensity of Yb3+ ions increase evidently which indicate that zinc-tungsten-oxyfluoride tellurite glass is a promising laser host matrix for high power generation. FT-IR spectra were used to analyze the effect of F- ions on OH- groups in this glass system. Analysis demonstrates that addition of fluoride in this tellurite glass removes the OH- groups and results in improvement of fluorescence lifetime of Yb3+. (c) 2004 Elsevier B.V. All rights reserved.