Er^(3+)/Yb^(3+)共掺锗碲酸盐玻璃的热稳定性、Judd-Ofelt理论分析和光谱性质

Thermal stability, Judd-Ofelt theory analysis and spectroscopic properties of a new Er^(3+)/Yb^(3+)-codoped germanotellurite glass

用高温熔融法制备了一种Er3+/Yb3+共掺的70TeO2-5Li2O-10B2O3-15GeO2玻璃.测试和分析了其热稳定性、吸收光谱、荧光光谱和上转换发光。应用Judd-Ofelt理论计算了玻璃中E3+的强度参数、自发辐射跃迁几率、辐射寿命以及荧光分支比。结果表明:这种玻璃具有较好的热稳定性,较宽的荧光半高宽和较大的受激发射截面,位于532 nm、546 nm和659 nm的上转换绿光和红光,分别对应于Er3+离子2H11/2→4I15/2,4S3/2→4I15/2和4F9/2→4I15/2的辐射跃迁,是一种较为合适的宽带光纤放大器和上转换激光器的基质材料。

The new Er^3＋/Yb^3＋-codoped 70TeO2-5Li2O-10B2O3-15GeO2 glass was by the technique of high-temperature melting. The thermal stability, absorption fluorescence spectra and upconversion spectra were measured and investigated. The prepared spectra, oscillator strength, spontaneous emission probability, radiative lifetime and emission branching ratio of several Er^3＋ transitions were calculated according to the Judd-Ofelt theory. It is found that this glass has good thermal stability, broad FWHM and large stimulated emission crosssection. The three upconversion emissions at about 532 nm, 546 nm and 659 nm, corresponding to the ^2H11/2→^4H15/2, ^4S3/2→^4I15/2 and 4F9/2→^4I15/2 transitions of Er^3＋, respectively, were simultaneously observed excited by 970 nm LD. The results show that this glass may be a suitable material for optical amplifiers and practical upconversion fiber optical devices.