Spectral Characterization of RE~(3+) (=Nd~(3+) or Er~(3+)): B_2O_3-BaO-LiF Glasses

摘要

We report here on the spectral properties of RE~(3+)(=Nd~(3+)or Er~(3+)) doped B_2O_3-BaO-LiF (BBLi) glasses. Absorption spectrum of Nd~(3+): BBLi glass has exhibited seven absorption bands at 430 nm, 511 nm, 525 nm, 582 nm, 680 nm, 745 nm, and 802 nm which correspond to the electronic transitions of ~4I_(9/2) →~2P_(1/2),~4I_(9/2)→~~4G_(9/2),~4I_(9/2) →~4G_(7/2).~4I_(9/2) ~4G_(5/2),~4I_(9/2)→~4F_(9/2),~4I_(9/2) →~4F_(7/2) and ~4I_(9/2) →~4F_(5/2) respectively. From the Nd~(3+)-glass, three emission bands have been measured at 902 nm (~4F_(3/2) →~4I_(9/2)), 1074 nm (~4F_(3/2) →~4I_(11/2)) and 1344 nm (~4F_(3/2) →~4I_(13/2)) with an excitation at 514.5 nm (Ar~+ ion laser). The Er~(3+)glass, has revealed seven absorption bands at 450 nm, 487 nm, 520 nm, 542 nm, 651 nm, 978 nm and 1528 nm which are labelled to the transitions of ~4I_(15/2) →~4F_(5/2),~4I_(15/2) →~4S_(7/2),~ 4I_(15/2) →~4H_(11/2),~4I_(15/2) →~4S_(3/2),~4I_(15/2) →~4F_(9/2),~4I_(15/2) →~4I_(11/2), and~4I_(15/2) →~4I_(13/2) respectively and for this glass, an emission at 1546 nm ~4I_(13/2) →~4I_(15/2) has been observed with an excitation at 514.5 nm. Apart from this XRD, FTIR, TG-DTA studies have also been carried out to evaluate the structural properties of these optical glasses.