Spectroscopic investigations of Er 3+ in H 3BO 3Na 2CO 3RCl glasses

Abstract

The optical properties of Er 3+ doped 80H 3BO 310Na 2CO 310RCl (RNa, K, Li, Zn and Pb) glasses have been measured. From the optical absorption measurements and using Judd-Ofelt theory, the Judd-Ofelt parameters, Ω 2, Ω 4 and Ω 6 , have been calculated. Measured oscillator strengths ( f meas) for various energy levels are compared with calculated values ( f cal) and are in reasonable agreement. The position of the absorption edge and hence the values of optical band gaps are reported for five compositions. The predicted radiative transition probabilities ( A), radiative lifetimes ( τ R), branching ratios (β) and integrated absorption cross sections (Σ) for the excited states 4G 11 2 , 4F 5 2 , 4F 7 2 , 4S 3 2 , 4F 9 2 , 4I 9 2 , 4I 11 2 and 4I 13 2 of Er 3+ in different chloroborate glasses are reported.