Near-infrared luminescence properties of Yb3+-doped lithium silicate glasses
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摘要: 为了研制高功率光纤激光器的掺镱纤芯材料，采用高温熔融法制备了0.70SiO2-0.18Li2CO3-0.04MgCO3-0.04BaCO3-0.02Al2O3-0.02Yb2O3（摩尔分数）锂硅酸盐玻璃样品，测试了其吸收光谱和858nm激发下的荧光光谱，进一步对光谱和激光性能参量进行了理论计算。结果表明，样品的主荧光峰位于1036nm附近，荧光有效线宽为94.1nm，吸收截面为1.143pm2，发射截面为1.024pm2，荧光寿命为0.98ms，激发态最小的粒子数仅为0.042，最小抽运强度为0.76kW·cm-2。与近年来相关文献中报道的镱掺杂玻璃相比，该掺镱锂硅酸盐玻璃在光谱及激光性能上比较有优势，有望在研制镱掺杂光纤中得到应用。Abstract: In order to develop ytterbium-doped core material of high-power fiber lasers, lithium silicate glass samples with ingredients 0.70SiO2-0.18Li2CO3-0.04MgCO3-0.04BaCO3-0.02Al2O3-0.02Yb2O3 (mole fraction) were prepared by the method of high temperature melting. Absorption spectrum in the range of 850nm~1100nm and fluorescence spectrum under excitation wavelength of 858nm were measured. Spectral and laser property parameters were theoretically calculated by using experimental data. The results demonstrate that the main fluorescence line with 1036nm wavelength has effective width of 94.1nm, absorption cross section of 1.143pm2, emission cross section of 1.024pm2 and fluorescence lifetime of 0.98ms. The least population of the exciting state is only 0.042 and the most minimal pump intensity is 0.76kW·cm-2. Compared with the recently reported Yb3+-doped laser glasses, the glass samples with these parameters are advantageous. This kind of Yb3+-doped lithium silicate glass is hopeful to apply in the preparation of Yb-doped fiber cores.
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Keywords:
- spectroscopy /
- lithium silicate glass /
- Monte Carlo method /
- near-infrared luminescence /
- Yb3+ ion
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Table 1 Physical properties of glass samples
ρ/(g·cm-3) n l/mm N/(1020 ·cm-3) 2.979 1.563 2.13 9.676 
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Table 2 Spectroscopic properties and laser performance parameters of glass sample and other Yb-doped glasses
glasses λp/ nm σabs(λp)/ pm2 Σabs/ 104pm3 λemi/ nm σemi(λemi)/ pm2 τf/ ms σemi·τf/ (pm2·ms) βmin Isat/ (kW·cm-2) Imin/ (kW·cm-2) Δλeff/ nm this work 858 1.143 3.755 1036 1.024 0.98 1.00 0.042 18.18 0.76 94.1 aluminum silicate[6] 983 2.34 - 992 1.02 0.29 0.30 0.18 - - - phosphate[8] 975 1.57 - 975 2.11 1.03 2.17 0.151 12.99 1.96 - fluorophos-phate[7] 972 1.56 7.15 1000 1.29 1.51 1.95 - - - - tellurite[12] 975 1.98 7.12 1001 1.36 0.96 1.31 - - 1.87 - borate[9] 975 1.42 5.546 995.8 0.96 1.04 1.00 0.18 2.59 14.39 34.6 borate silicate [13] 975 0.525 - 1013 0.23 1.34 0.31 - - - - aluminum silica[14] 976 1.03 - 1034 1.38 0.48 0.66 - - - -
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