Abstract
Emissions at 2.7μm from telluride glasses with various Er2O3 doping concentrations are investigated. The prepared glasses have excellent thermostability and high rare-earth solubility. Judd–Ofelt parameters are calculated based on the absorption spectra. A large emission cross section (1.12×10−20cm2) and a high spontaneous radiative coefficient (57.8s−1) are obtained at 2.7μm. The fluorescence properties of glasses with different concentrations are analyzed and presented. An Er3+-doped fiber is fabricated via a rod-in-tube technique, and the loss at 1310nm is ∼2.1dB/m measured by using the cut-back method. Strong upconversion emission caused by intense pump absorption is observed from the Er3+doped fiber under excitation by a 980nm laser diode (LD).Telluride glasses with high Er3+ doping concentration and good thermal property are prepared. Energy transfer processes for 1.5μm, and 2.7μm, as well as visible emission are fully discussed. Enhanced 2.7μm emission is achieved from the bulk glass. An Er3+ doped fiber is successfully drawn, and strong upconversion emission is observed in the fiber.
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