Raman gain in modified tellurite glasses and thin films

We report the tailoring of Raman spectra of the tellurite glass by varying molar concentrations of phosphates, fluorides in phosphate modified tellurite glasses to analyze the Raman gain. From the measured Raman spectrum, the Raman gain and gain bandwidth in these glasses were calculated and compared. The structural features that give rise to the observed spectra and its dependence on glass composition are identified and reported. Raman gain as high as 170 × 10− 13 m/W is obtained for glass modified by zinc oxide. Glass thin films prepared by pulsed laser deposition show a Raman gain of 5.0 × 10− 13 m/W suggesting their importance in short waveguide Raman amplifier fabrication.