Ytterbium doped sodium phosphotellurite glasses are made with different Yb<sup>3+</sup> concentrations. Physical properties of the new glasses are reported. The glasses show high absorption and emission cross-sections and higher lifetime of [equation] transition. Laser performance parameter <i>σ<sub>e</sub></i> × <i>τ<sub>f</sub></i>, with a value as high as 2.14×10<sup>-20</sup> cm<sup>2</sup>-ms and the laser threshold intensity as low as 1.79 KW/cm<sup>2</sup> are reported. The laser parameters of these Yb<sup>3+</sup> doped glasses show that they are potential to fabricate high power laser and broadband optical amplifiers.