Er^(3+)离子掺杂的碲酸盐玻璃光谱性质分析

Spectroscopic Properties Analysis of Er^(3+)-doped Tellurite Glass

用976 nm光激发测量了室温下掺Er3+碲酸盐玻璃的上转换发光,讨论了上转换发光机制.同时测量了掺Er3+离子碲酸盐玻璃的吸收光谱和荧光光谱,发现掺Er3+离子碲酸盐玻璃的荧光半高宽可达80 nm,应用McCumber理论计算了1 531 nm处的受激发射截面可达0.75×10-20cm2.对Er3+离子在不同基质玻璃中光谱特性的比较,发现了Er3+离子在碲酸盐玻璃中具有相对较高的受激发射截面和宽的荧光半高宽.

The up-conversion spectrum and the energy transfer mechanism of Er^3＋ ion in tellurite glasses were analyzed at room temperature. The much lower phonon energy of tellurite glass makes it have different upconversion mechanism compared with other glasses with relative higher phonon energy, Up-conversion emission is very harmful for fiber amplifiers, which not only reduce the efficiency of bump light, but also deteriorate the noise figure of the amplifiers, so it is important to reduce up-conversion phenomenon as much as possible. The absorption spectrum and the fluorescent spectrum were investigated. The stimulated emission cross section was calculated using Mc-Cumber theory and the FWHM was obtained according to the fluorescent spectrum . Er^3＋ ion shows higher emission cross section （σemi =0.75 × 10^-20 cm^2） and larger FWHM （80nm） in tellurite glass than those in other glass hosts, which are very important parameters for optical amplifiers to realize broadband and high gain amplification.