铝锗酸盐玻璃中铒离子升频荧光光子定量

Quantitation of Frequency Upconversion Fluorescence Photons of Erbium Ions in Aluminum Germanate Glasses

研究了波导适用型Er^(3+)/Yb^(3+)掺杂铝锗酸盐玻璃的绝对光谱功率分布和净发射光子数分布,实现了稀土离子升频荧光参量的绝对量化。采用积分球配以电荷耦合器件(CCD)探测器系统对Er^(3+)离子升频荧光性能进行表征,解析出绝对光谱功率分布,进一步导出升频荧光净发射光子数与量子产率等荧光参数。结果表明,Er^(3+)/Yb^(3+)掺杂铝锗酸盐玻璃在380!C的KNO_3熔盐中K^+-Na^+离子交换有效扩散速率为0.077μm^2/min。Er^(3+)经975nm抽运光照射,发射出绿光(548nm)与红光(661nm),其中红光为支配性发射。在激光功率密度为1227 W/cm^2时,红光光谱功率输出和净发射光子数分别可达47.86μW和16.03"10^(13) s^(-1)。相对于比较法给出的锗酸盐玻璃荧光量子产率量级10^(-6)~10^(-5),绝对光子定量测量能提供更精确的指标,使波导适用型铝锗酸盐玻璃中稀土升频荧光测试参数的准确性和可重复性得到显著提升。

The absolute spectral power distribution and net emission photon distribution of Er3＋/Yb3~ doped waveguide-type aluminum germanate glasses are investigated, and the absolute quantification of upconversion fluorescence parameters of rare earth ion are realized. The performance of Er3＋ ion upconversion fluorescence is characterized by integrating sphere and charge-coupled device detector system. The absolute spectral power distribution of upconversion fluorescence is analyzed. Further, the fluorescence parameters such as the number of the net emission photon and the quantum yields are derived. The results show that the effective diffusion rate of K＋-Na＋ ion-exchange in the glass sample of Er3＋/Yb3＋ doped aluminum germanate glasses in KNO3 fused salt at 380℃ is 0.077 μm^2/min. The green light and red light centered at 548 nm and 661 nm are emitted after Er3＋ illuminated by 975 nm pump light, and the red light is dominant emission. The output power and the net emission photon of dominant red emission are 47.86 /LW and 16.03 ×10^13 s-1 respectively, when the laser power density is 1227 W/cm^2. Compared with the relative measurement method whose fluorescence quantum yield magnitude in germanate glass stays within the range o[ 10^-6-10^-1, absolute method /or photon quantification can provide more accurate data, which significantly improves the accuracy and repeatability of test parameters for rare earth upconversion fluorescence in waveguide-type aluminum germanate glasses.