Investigation of luminescence parameters of novel glasses with composition TeO2-ZnO-NaF-MoO2-Er2O3 as laser material

Fluoroquaternary glasses within system 70TeO2-10ZnO-10NaF-(10 − x)MoO2-xEr2O3 doped with different concentration of xEr2O3 ions were prepared by using melt- quenching technique. The amorphous nature of the glasses confirmed by using X-ray diffraction. Physical parameters viz.: density (ρ), molar volumes (Vm), refractive index (n), an optical energy gap (Eg) and Urbach energy (ΔE) values of prepared glasses were evaluated. Moreover, the Judd-Ofelt parameters Ω2, Ω4, Ω6, the oscillator strength type transition probabilities, Smeas, Scal, spectroscopic quality factors, X, branching ratio, βR and radiative lifetimes, τR, of several excited states of Er3+ have been computed. The gain cross-section of laser transition level from 4I13/2 → 4I15/2 and stimulated emission cross-section estimated with different concentration of Er2O3 ions in all present glasses. Here the spectroscopic properties indicate that these glasses doped with Er3+ are a promising candidate for optical applications.