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A series of highly Er~(3+)/Yb~(3+) co-doped fluoroaluminate glasses have been investigated in order to develop a microchip laser at 1.54 μm under 980 nm excitation. Measurements of absorption, emission and upconversion spectra have been performed to examine the effect of Er~(3+)/Yb~(3+) concentration quenching on spectroscopic properties. In the glasses with Er~(3+) concentrations below 10 mol%, concentration quenching is very low and the Er~(3+)/Yb~(3+) co-doped fluoroaluminate glasses have stronger fluorescence of 1.54μm due to the ~4I_(13/2)→~4I_(15/2) transition than that of Er~(3+) singly-doped glasses. As Er~(3+) concentrations above 10 mol% in the Er~(3+)/Yb~(3+) co-doped samples, concentration quenching of 1.54μm does obviously occur as a result of the back energy transfer from Er~(3+) to Yb~(3+). To obtain the highest emission efficiency at 1.54μm, the optimum doping-concentration ratio of Er~(3+)/Yb~(3+) was found to be approximately 1:1 in mol fraction when the Er~(3+) concentration is l
A series of highly Er ~ (3 +) / Yb ~ (3+) co-doped fluoroaluminate glasses have been investigated in order to develop a microchip laser at 1.54 μm under 980 nm excitation. Measurements of absorption, emission and upconversion spectra have been In the glasses with Er ~ (3 +) concentrations below 10 mol%, the concentration quenching is very low and the Er ~ (3 + (3+) / Yb ~ (3+) co-doped fluoroaluminate glasses have stronger fluorescence of 1.54μm due to the ~ 4I_ (13/2) → ~ 4I_ (15/2) transition than that of Er ~ (3+) concentration of 10 mol% in the Er ~ (3 +) / Yb ~ (3+) co-doped samples, concentration quenching of 1.54μm does obviously occur as a result of the The energy transfer from Er ~ (3+) to Yb ~ (3+) was obtained. To obtain the highest emission efficiency at 1.54μm, the optimum doping-concentration ratio of Er ~ (3 +) / Yb ~ (3+) was found to be approximately 1: 1 in mol fraction when the Er ~ (3+) concentration is l