掺Er^(3+)镓磷酸盐玻璃的光学性质

OPTICAL PROPERTIES OF ERBIUM DOPED GALLIUM PHOSPHATE GLASSES

利用熔融淬火法制备了摩尔分数为40.8Ga2O3-58.0NaPO3-1.2Er2O3掺Er3+镓磷酸盐玻璃,测试并研究了样品中Er3+的吸收光谱、1.5μm发射光谱,根据Judd-Ofelt理论计算了Er3+离子强度参量Ωt(t=2,4,6)及自发辐射概率、荧光分支比、自发辐射寿命.结果表明,Er3+1.5μm发射光谱半峰全宽达到40 nm.同时,利用McCumber方法计算了Er3+4I13/2→4I15/2跃迁的受激发射截面,峰值达到6.10×10-21cm2,测定了Er3+4I13/2能级荧光寿命为4.88 ms,4I13/2能级量子效率为56.3%.

Er^3＋-doped gallium phosphate glasses with the compositions of 40. 8Ga2O3-58. 0NaPO3-1. 2Er2O3 （mol%） were synthesized by melt-quenching method. Absorption and 1.5 μm emission spectra of Er^3＋ were recorded and investigated. According to Judd-Ofelt theory, the intensity parameters Ωt（t = 2,4,6） were calculated, by which spontaneous emission probabil- ity, fluorescence branching ratio, radiative lifetime of Er^3＋ were evaluated. The full width at half maximum of 1.5μm emission spectrum is 40 nm. The stimulated emission cross-section at ^4I13/2→^4I15/2 transition of Er^3＋ were calculated by McCumber method, and the peak value were found to be 6. 10×10^-21 cm^2. The measured lifetime of level ^4I13/2 of Er^3＋ is 4. 88 ms, the quantum efficiency is 56.3 %.