Near-IR emission in Pr3+single doped and tunable near-IR emission in Pr3+/Yb3+ codoped tellurite tungstate glasses for broadband optical amplifiers

A study of the broadband near-infrared emission in Pr3+ single doped and Pr3+/Yb3+ codoped tellurite-tungstate glasses for optical amplification is presented. In the Pr3+ single doped samples pumped at 474 nm the emission band at 1480 nm presents a FWHM of ∼140 nm. The Yb3+ addition produces a FWHM broadening up to ∼155 nm, achieved through the 1G4-3H5 transition. The emission spectra when the codoped sample is pumped at 980 nm shows efficient energy transfer from Yb3+ to Pr3+, resulting in an intense Pr3+ emission around 1330 nm. This shows that changing the pump wavelength it is possible to select the 1D2-1G4 or the 1G4-3H5 transition, displacing the emission band from ∼1480 to ∼1330 nm.