Spectroscopic properties of Er 3+ ions in (GeS 2) 80(Ga 2S 3) 20 glasses

Abstract

Chalcogenide (GeS 2) 80(Ga 2S 3) 20 glasses doped with 0.6 and 1.8 mol% Er 2S 3 have been characterized with some basic optical parameters by the evaluation of their absorption and photoluminescence spectra. Typical absorption bands for Er 3+ doped glasses have been observed at 656, 802, 980 and 1535 nm, which are connected with the corresponding 4f-shell transitions in Er 3+ ions. The Judd–Ofelt (J–O) theory has been applied to calculate J–O intensity parameters Ω λ ( λ = 2, 4 and 6) from the experimental oscillator strengths ( f exp). The J–O intensity parameters have been utilized for the determination of radiative properties such as radiative transition probabilities ( A R), total radiative transition probabilities ( A T) and radiative lifetimes ( τ R). The influence of temperature on the PL emission at ∼1540 nm using excitation wavelength of 514.4 nm has been specified and spectroscopic properties, such as stimulated emission cross-section and figure of merit (FOM) at the 4I 13/2 → 4I 15/2 transition, have been determined as well, accounting the role of Er 3+ doping level.