Judd–Ofelt parametrization and radiative transitions analysis of Tm 3+ doped alkali chloroborophosphate glasses

Abstract

Absorption spectra for Tm 3+ doped alkali chloroborophosphate glasses are recorded in the UV–VIS and NIR regions. The assigned energy level data of Tm 3+ (4f 12) in these glasses are analysed in terms of a parametrized Hamiltonian model that includes 14 free-ion parameters. From the measured oscillator strengths of the absorption bands, the intensity parameters, Ω λ , are calculated by using the Judd–Ofelt theory. Using these data, radiative transition probabilities, radiative lifetimes, branching ratios and integrated absorption cross-sections for 3P 0, 1D 2 and 1G 4 fluorescent levels are calculated. Certain laser transitions are predicted.