Abstract

Energy transfer at 1500 nm in lead fluoroborate glasses (PbOPbF2B2O3) codoped with Er3+ and Yb3+ is studied for the first time to the authors’ knowledge. A sample codoped with 1 mol. % of Yb2O3 and 0.01 mol. % of Er2O3 has a measured fluorescence lifetime of (1.30±0.07) 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±0.06)×10-20cm2. The calculated Judd–Ofelt parameters are Ω2=(3.51±0.14)×10-20 cm2, Ω4=(1.09±0.07)×10-20 cm2, and Ω6=(0.94±0.07)×10-20 cm2. The temporal evolution of the Yb3+ fluorescence is fitted by use of the Yokota–Tanimoto expression to yield the Yb3+ diffusion constant [(1.6±0.2)×10-10 cm2 s-1] and the critical radius of Yb3+/Er3+ (18±1)×10-8 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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