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We study the upconversion properties of Ta2O5 and Nb2O5 based TeO2 glasses doped with 0.5 mol% Er2O3 after excitation into the 4I1½ level using 980 nm radiation. Green and red emission is observed originating from the (2H1½, 4S3/2) and 4F9/2 states, respectively. Excited state absorption and energy trasnfer are discussed as possible mechanisms for the upconversion.
John A. Capobianco,Fiorenzo Vetrone,John-Christopher Boyer,Adolfo Speghini, andMarco Bettinelli
"Compositional effect on the upconversion of Ta2O5 and Nb2O5 based tellurite glasses", Proc. SPIE 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life, (19 November 2003); https://doi.org/10.1117/12.524921
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John A. Capobianco, Fiorenzo Vetrone, John-Christopher Boyer, Adolfo Speghini, Marco Bettinelli, "Compositional effect on the upconversion of Ta2O5 and Nb2O5 based tellurite glasses," Proc. SPIE 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life, (19 November 2003); https://doi.org/10.1117/12.524921