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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Ωt(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。
Fiber lasers doped with photonic crystal fibers have attracted much attention of researchers. The preparation of rare earth-doped glass used in photonic crystal fiber cores has become a key issue in the development of doped photonic crystal fibers. The erbium-doped cadmium-aluminum-heavy metal silicate glass samples were prepared by high temperature melting process, and their absorption spectra, fluorescence spectra and fluorescence lifetime were tested. Judd-Ofelt theory was used to calculate the strength parameters of the sample Ωt (t = 2, 4, 6) and the theoretical and experimental oscillator strength, spontaneous emission probability, fluorescence branching ratio and fluorescence radiation lifetime of erbium ions. Fluorescence spectra were used to calculate the stimulated emission cross section and half width of fluorescence of 4I13 / 2 → 4I15 / 2. The results show that the erbium-doped cadmium-aluminate heavy metal silicate glass has a larger stimulated emission cross-section and a wider FWHM and a higher quantum yield of 92.6%. Compared with the erbium-doped glass in related literatures, Has good laser excitation properties, is expected to be developed in the application of doped photonic crystal fiber.