宽带光放大器用掺Er3+碲钨酸盐玻璃

制备了掺Er^3 的TeO2-WO3-ZnO-ZnF2(TWZOF)玻璃，测量了Er^3 在玻璃中的吸收光谱和970nm激光二极管激发下的荧光光谱和荧光寿命，分别采用J-O理论和McCumber理论计算了Er^3 离子的J-O强度参量Ωt(t=2，4，6)和其1．5μm发射的吸收截面和发射截面，研究了其荧光强度、荧光寿命和发射带宽与ZnF2含量的关系。结果表明，Er^3 在TWZOF玻璃中具有较大的1．5μm发射截面，其峰值发射截面为0．86pm^2;同时，Er^3 在TWZOF玻璃中具有很大的1．5μm发射带宽，所得半峰全宽在68～83nm之间；Er^3 在TWZOF玻璃中还具有较小的Ω2值和较大的Ω6值，且随ZnF2含量的增加，Ω2和Ω4均增大；Er^3 离子1．5μm发射峰值荧光强度和荧光寿命总体也随ZnF2含量的增加而增加。

Er3+ -Doped Tungsten-Tellurite Glasses for Broadband Optical Amplifier

The Er3+-doped TeO2-WO3-ZnO-ZnF2(TWZOF) glasses were prepared. The absorption spectra, 1.5 μm emission spectra and fluorescence lifetimes of Er3+, excited at 970 nm, were measured. The J-O parameters Ωt (t=2,4,6), absorption and emission cross-sections were calculated by Judd-Offelt theories and McCumber theory, respectively. The dependence of the content of ZnF2 in glass composition upon 1.5 μm emission intensity, fluorescence lifetime and bandwidth of Er3+ was investigated. In TWZOF glass, Er3+ ion had a large emission cross-section with a peak value of 0.86 pm2. Er3+ ions also had a broad 1.5 μm emission spectrum in the glass, which had a FWHM between 68 nm and 83 nm. The maximum FWHM demonstrated here was 83 nm. Er3+ ion had a large value of Ω6 and a small value of Ω2 in TWZOF glass. With the increasing of the content of ZnF2, The Ω2 and the Ω6 both increased. The emission intensity at peak wavelength and the fluorescence lifetime of Er3+ at 1.5 μm also increased with the increasing of the content of ZnF2.