Energy transfer and upconversion in erbium-ytterbium-doped fluoride phosphate glasses

Philipps, J.F., Topfer, T., Ebendorff-Heidepriem, H., Ehrt, D. and Sauerbrey, R. (2002) Energy transfer and upconversion in erbium-ytterbium-doped fluoride phosphate glasses. Applied Physics B: Lasers and Optics, 74 (3), 233-236. (doi:10.1007/s003400200804).

Abstract

The energy-transfer rate coefficient from ytterbium to erbium (K) and upconversion rate coefficient for erbium (C) are determined by analysis of erbium fluorescence decay under different pumping conditions. A simple rate-equation model was used to describe the fluorescence dynamics. Numerical analysis of the model delivered K and C as fit parameters to the experimental curves. Values of K ranging from 0.75-1.42 x 10^-16 cm³/s and C from 0.8-1.7 x 10^-18 cm³/s were found. The results obtained are of the same magnitude as results for phosphate glasses reported in the literature. Further analysis showed that high erbium concentrations (2 x 10²⁰ cm^-3 ) need a much higher pump intensity to reach threshold due to increased losses caused by upconversion.

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