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

Fluoroquatemary glasses within system 70TeO(2)-10ZnO-10NaF-(10-x)MoO2-xEr(2)O(3) doped with different concentration of xEr(2)O(3) ions were prepared by using melt- quenching technique. The amorphous nature of the glasses confirmed by using X-ray diffraction. Physical parameters viz.: density (rho), molar volumes (V-m), refractive index (n), an optical energy gap (Eg) and Urbach energy (Delta E) values of prepared glasses were evaluated. Moreover, the Judd-Ofelt parameters Omega(2), Omega(4), Omega(6), the oscillator strength type transition probabilities, S-meas, S-cab spectroscopic quality factors, X, branching ratio, beta(R) and radiative lifetimes, tau(R), of several excited states of Er3+ have been computed. The gain cross-section of laser transition level from I-4(13/2)-> I-4(15/2) 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.