Abstract
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 474nm the emission band at 1480nm presents a FWHM of ∼140nm. The Yb3+ addition produces a FWHM broadening up to ∼155nm, achieved through the 1G4–3H5 transition. The emission spectra when the codoped sample is pumped at 980nm shows efficient energy transfer from Yb3+ to Pr3+, resulting in an intense Pr3+ emission around 1330nm. 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 ∼1330nm.
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