OPTICAL TRANSITIONS OF Er3+ DOPED TELLURITE GLASSES

Abstract

Er³⁺ doped tellurite glasses of molar composition (80-x)TeO₂-18ZnO-1MgO-1Li₂O-(x)Er₂O₃ system (0.5mol.% £ x £ 2.5mol.%) have successfully been made by melt quenching technique. The absorption spectra were measured and the Judd-Ofelt analysis was performed. It is found that the spectrum of UV-Vis-NIR spectroscopy is consists of absorption peaks around 1530nm, 974nm, 798nm, 652nm, 544nm, 522nm, 488nm, 452nm, 444nm, and 406nm, and are correspond to the transitions from ground state ⁴I_15/2 to the excited state of ⁴I_13/2, ⁴I_11/2, ⁴I_9/2, ⁴F_9/2, ⁴S_3/2, ²H_11/2, ⁴F_7/2, ⁴F_5/2, ⁴F_3/2, and ²H_9/2 respectively. The Judd-Ofelt parameters W₂, W­₄, W₆ have been used to correlate between the composition and the change of structure of the host glass. It is found that the Er³⁺ content exhibits some influence on the spectroscopic properties of the optical transition for Er³⁺ ions.