Mid-infrared luminescence and energy transfer of Tm~(3+)/Yb~(3+) doped fluorophosphate glass

摘要

Tm~(3+)/Yb~(3+)-codoped fluorophosphate glass is prepared by conventional melt-quenching method and the thermal stability of the glass is analyzed. The Judd-Ofelt parameters, radiation emission rates, radiative lifetime and branching ratios of prepared samples are calculated based on the absorption spectra. Upon excitation of a conventional 980 nm laser diode, 1.8 μm emission is obtained from Yb~(3+)/Tm~(3+) codoped fluorophosphate. Additionally, the energy transfer between Yb~(3+) and Tm~(3+) ions are quantitatively analyzed. Hence, this Yb~(3+)/Tm~(3+) codoped fluorophosphate glass possessing high energy transfer efficiency and excellent thermal stability is a good candidate for efficient 1.8 μm laser.