Raman gain spectra in a series of phospho-tellurite samples have been investigated using Raman scattering technique. Glasses considered in the present study were synthesized using conventional melting and quenching of oxides and/or carbonates at identical conditions. Thermal and optical properties of these glasses were also determined. Effects of NbO6, WO3, and P2O5 on the resultant Raman gain spectra of the phospho-tellurite glasses considered here are discussed.
