Optical parameters and upconversion fluorescence in Tm3+/Yb3+ codoped tellurite glass

Tm³⁺/Yb³⁺ codoped tellurite glass has been prepared. Density, refractive index, optical absorption, Judd-Ofelt parameters and spontaneous transition probabilities of Tm³⁺ have been measured and calculated, respectively. Intense blue three-photon upconversion fluorescence and S-band (1470 nm) fluorescence were investigated under the excitation of a 980 nm diode laser at room temperature. Judd-Ofelt parameters, strong blue three-photon upcoversion emission of Tm³⁺ in glass indicate that Tm³+/Yb³⁺ codoped tellurite glass is a promising blue color upconversion optical and laser material. In addition, experiment results showed the 980 nm laser was more efficient than 808 nm laser when pumping Tm³⁺/Yb³⁺ codoped tellurite glass, Tm³⁺/Yb³⁺ codoped tellurite glass also could be a promising material for S-band amplification.