Abstract

To investigate the relatively unexplored 1.2 μm region, we identified a near-infrared emission at around 1.23 μm from ${\mathrm{Er}}^{3+}/{\mathrm{Pr}}^{3+}$-codoped water-free fluorotellurite glass with a composition of $60\mathrm{Te}{\mathrm{O}}_2\text{-}30{\mathrm{ZnF}}_2\text{-}10\mathrm{NaF}$ (TZNF60, mol. %). Under the condition of pumping with the 488 nm optical parametric oscillator (OPO) laser system, the directly measured lifetime (${\tau }_f$) at 1.23 μm in Er/Pr-codoped fluorotellurite glasses is about 111.2 μs, much longer than that of Er-doped fluorotellurite glass (80.1 μs). The stimulated emission cross section (${\sigma }_{\mathrm{em}}$) and quantum efficiency ($\eta$) for ${\mathrm{Er}}^{3+}\text{:}{{}^4\mathrm{S}}_{3/2}\to {{}^4\mathrm{I}}_{11/2}$ transition are greatly enhanced when appropriate ${\mathrm{Pr}}^{3+}$ ions are incorporated. These advances arise partially from the absence of the hydroxyl (OH) group and low phonon energy with the addition of a large amount of fluorides into oxide-based host glasses. With high quantum efficiency (56.2%) and a large stimulated cross section ($4.03\times {10}^{-21}{\mathrm{c}\mathrm{m}}^2$), ${\mathrm{Er}}^{3+}/{\mathrm{Pr}}^{3+}$-codoped TZNF60 glass is regarded as promising material for the development of optical amplification and laser operation at the relatively unexplored 1.2 μm region.

© 2013 Optical Society of America

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