Er3+单掺与Er3+/Pr3+共掺碲酸盐玻璃的2.7 μm光谱性质及能量转移过程

采用高温熔融法制备了不同浓度Er³⁺，Er³⁺/Pr³⁺共掺的60TeO2-30WO3-10La2O3玻璃。研究了玻璃的红外透过光谱，吸收光谱以及在980 nm LD抽运下的荧光光谱和Er3+4I13/2能级荧光寿命。根据红外光谱计算了玻璃中OH-的吸收系数α。应用Judd-Ofelt理论计算了J-O参量，自发辐射系数Arad，荧光分支比β；利用Fuchtbauer-Laderburg理论计算了2.7 μm受激发射截面。分析了980 nm抽运时Er3+/Pr3+共掺的能量转移过程。计算得到OH-吸收系数α为0.57 cm-1，2.7 μm自发辐射系数Arad为60.6 s-1，荧光分支比β为16.3%，最大受激发射截面达到1.13×10-20 cm2。结果表明，这种碲酸盐玻璃适合作为获得2.7 μm输出的激光材料。

Abstract

Er3+ singly doped and Er3+/Pr3+co-doped tellurite glasses 60TeO2-30WO3-10La2O3 are prepared by conventional melting method. The fluorescence spectra and lifetime of Er3+4I13/2 level pumped by 980 nm laser diode (LD) are investigated. The infrared and absorption spectra are measured. The absorption coefficient α is calculated based on the infrared spectrum. The spontaneous radiative coefficient Arad and fluorescence ratio β are acquired by Judd-Ofelt theory. Fuchtbauer-Laderburg theory is applied to calculate the stimulated emission cross section around 2.7 μm. The energy transfer processes and spectroscopic properties of Er3+-doping and Er3+/Pr3+ co-doping are analyzed under 980 nm LD excitation. The calculated absorption coefficient α of OH- is 0.57 cm-1, the spontaneous radiative coefficient Arad, fluorescence ratio β and the maximum stimulated emission cross section of Er3+4I11/2 to 4I13/2 transition are 60.6 s-1, 16.3%, and 1.13×10-20 cm2, respectively. The results indicate that this kind of tellurite glass is a promising matrix for 2.7 μm laser.

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范小康, 王欣, 李夏, 李科峰, 胡丽丽. Er³⁺单掺与Er³⁺/Pr³⁺共掺碲酸盐玻璃的2.7 μm光谱性质及能量转移过程[J]. 光学学报, 2014, 34(1): 0116001. Fan Xiaokang, Wang Xin, Li Xia, Li Kefeng, Hu Lili. 2.7 μm Fluorescence and Energy Transfer Process in Er³⁺-Doped and Er³⁺/Pr³⁺ co-Doped Tellurite Glasses[J]. Acta Optica Sinica, 2014, 34(1): 0116001.

Er³⁺单掺与Er³⁺/Pr³⁺共掺碲酸盐玻璃的2.7 μm光谱性质及能量转移过程

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