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Excitation-power dependency of upconversion (UC) photons have been quantified in Tm3+/Yb3+ doped fluorotellurite (BALMT) glasses under the excitation of 975nm laser. The net powers of three-photon-excited blue and red and two-photon-excited NIR emissions are determined to be 242, 101 and 7994μW in 0.5wt% Tm2O3 and 2wt% Yb2O3 co-doping case under the excitation power of 870mW, respectively, and the...
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