以掺杂光子晶体光纤为介质的光纤激光器一直受到科研工作者的广泛关注, 应用于光子晶体光纤纤芯的掺稀土元素玻璃的制备成为研制掺杂光子晶体光纤的关键问题。利用高温熔融工艺制备掺铒镉铝重金属硅酸盐玻璃样品, 测试了其吸收光谱、荧光光谱和荧光寿命。采用Judd-Ofelt理论, 计算了样品的强度参数?赘t (t=2,4,6)以及铒离子的理论和实验振子强度、自发辐射几率、荧光分支比和荧光辐射寿命等参数, 利用测得的荧光光谱计算了铒离子能级4I13/2→4I15/2的受激发射截面及荧光半高宽。结果表明: 掺铒镉铝重金属硅酸盐玻璃具有较大的受激发射截面和比较宽的荧光半高宽, 量子效率较高, 达92.6%, 与相关文献中的铒掺杂玻璃相比, 具有良好的激光激发性能, 有望在研制掺杂光子晶体光纤中得到应用。

Photonic crystal fiber lasers have been paid much attention by many researches, and the preparation of photonic crystal fiber cores becomes the key problem in the study of the photonic crystal fibers. Er3+ doped aluminium-cadmium heavy-metal silicate glass sample was prepared by the method of high temperature melting. Its absorption and fluorescence spectra were measured. Using the Judd-Ofelt theory, its intensity parameter ?赘t (t=2,4,6), the oscillator strength and spontaneous radiation probability of the Er 3+ ion, fluorescence branching ratio, and the fluorescence lifetime were theoretically calculated. Using the fluorescence spectrum, the stimulated emission cross section of the 4I13/2→4I15/2 transition and the full width at half maximum(FWHM) of the fluorescence band were also measured. The result demonstrates that the Er3+ doped aluminium-cadmium heavy-metal silicate glass sample possesses a large stimulated emission cross section, a wide fluorescence FWHM, and high quantum efficiency of 92.6%. These parameters clearly indicate that this kind of silicate glass has a good laser excitation property and is expected to be applied in the study of the doped photonic crystal fibers.