The Er3+:Yb3+ co-doped potassium-lead-germanate glass with optimum ratio 0.5 mol. % of Er3+ and 2.5
mol. % of Yb3+ (1:5) was prepared by using the conventional melting and quenching method. Raman spectroscopy
and FT-IR were used to study the structure and the vibrational modes of this glass. Measurement of Raman
spectroscopy showed that the maximum phonon energy of this glass was approximately 811 cm-1. Optical
absorption was measured to make it easy to choose the pump wavelength. X-ray diffraction confirmed that there
were no periodic arrangements in the glass; i.e. it was amorphous. Differential thermal confirmed the thermal
stability of this glass. The two probe method was used to investigate the electrical behavior and to measure the DCconductivity
and its temperature dependence. The introduced here system was designed using a longitudinal
pumping source of 808 nm diode laser at different powers and the diagnoses of the system output was measured by
double monochromator (SpectraPro 500i of ACTON) in the range of 790-1800 nm. The system output was found to
increase with increasing the pumping power. The emission of the rod showed strong line at about 1600 nm. This
might confirm that the proposed here design of Er-glass laser can be used in telecommunication applications.