Optical Analysis of Er3+:Boro-Fluoro-Phosphate Glasses

Measured Vis-NIR absorption spectra of Er3+:boro-fluoro-phosphate glasses have revealed nine absorption bands at 377 nm, 405 nm, 450 nm, 486 nm, 519 nm, 543 nm, 649 nm, 973 nm and 1529 nm, which correspond with the transitions of 4I15/2 → 4G11/2, (2G9/2,4H9/2), 4F5/2, 4F7/2, 2H11/2, 4S3/2, 4F9/2, 4I11/2, and 4I13/2, respectively. With an excitation at λexci = 375 nm, a bright green emission (4S3/2 → 4I15/2) at 547 nm has been observed from these erbium glasses. Judd-Ofelt characteristic intensity Ωλ (λ = 2, 4, 6) parameters are obtained from the absorption spectra, and these results were used to compute the radiative properties of Er3+:boro-fluoro-phosphate glasses. The NIR emission (4I13/2 → 4I15/2) at 1547 nm from these glasses was measured with an Ar+ laser (514.5 nm) as an excitation source