Abstract

Energy transfer at 1500 nm in lead fluoroborate glasses $(\mathrm{PbO}–{\mathrm{PbF}}_2–{\mathrm{B}}_2{\mathrm{O}}_3)$ codoped with ${\mathrm{Er}}^{3+}$ and ${\mathrm{Yb}}^{3+}$ is studied for the first time to the authors’ knowledge. A sample codoped with 1 mol. % of ${\mathrm{Yb}}_2{\mathrm{O}}_3$ and 0.01 mol. % of ${\mathrm{Er}}_2{\mathrm{O}}_3$ has a measured fluorescence lifetime of $(1.30\pm 0.07) \mathrm{ms}$ and an energy transfer efficiency of 80%. Also, a large emission band, of 72.4 nm has a measured peak emission cross section of $(0.73\pm 0.06)\times {10}^{-20}{\mathrm{cm}}^2.$ The calculated Judd–Ofelt parameters are ${\mathrm{\Omega }}_2=(3.51\pm 0.14)\times {10}^{-20} {\mathrm{cm}}^2,$ ${\mathrm{\Omega }}_4=(1.09\pm 0.07)\times {10}^{-20} {\mathrm{cm}}^2,$ and ${\mathrm{\Omega }}_6=(0.94\pm 0.07)\times {10}^{-20} {\mathrm{cm}}^2.$ The temporal evolution of the ${\mathrm{Yb}}^{3+}$ fluorescence is fitted by use of the Yokota–Tanimoto expression to yield the ${\mathrm{Yb}}^{3+}$ diffusion constant $[(1.6\pm 0.2)\times {10}^{-10} {\mathrm{cm}}^2 {\mathrm{s}}^{-1}]$ and the critical radius of ${\mathrm{Yb}}^{3+}/{\mathrm{Er}}^{3+}$ $(18\pm 1)\times {10}^{-8} \mathrm{cm}.$ Results with the singly doped samples produced are presented to clarify the energy transfer process.

© 2002 Optical Society of America

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