Study of optical properties of zinc-tellurite glasses doped with Yb3+, Tm3+ and Er3+: Analysis of the influence of rare-earth ions doping on host matrix modification.

By means of UV-VIS absorption measurements to zinc-tellurite glasses doped with Yb, Tm and Er, we obtained the band gaps, Urbach energies, the polarizability values and the Judd-Ofelt parameters, which indicated an increase in the structural disorder in the host matrix.