应用二氧化碳激光熔融法加工掺铒光纤顶端,依靠表面张力在光纤顶端形成球形度较高的掺铒微球腔。室温下测量熔融法制备的尺寸为21μm的掺铒微球,通过精确调节掺铒微球的位置使980nm的泵浦光照到合适的位置,得到了铒离子能级跃迁单一模式的荧光谱线,中心波长在1.55μm左右,证明了微腔的选频作用。通过进一步分析谱线计算出微球的Q值在108量级,实验测得自由频谱宽度与理论计算的结果基本一致。 The tip of erbium-doped fiber is processed by carbon dioxide laser melting method, and the erbium-doped microballoon cavity with higher sphericity is formed by the surface tension on the tip of fiber. Erbium-doped microspheres with a size of 21μm prepared by melt method were measured at room temperature. Fluorescence spectra of single-mode erbium ion level transitions were obtained by precisely adjusting the position of the erbium-doped microspheres to 980nm pump light. The center wavelength is about 1.55μm, which proves the effect of frequency selection of microcavities. By further analysis of the spectrum calculated microspheres Q value of 108 orders of magnitude, experimentally measured free spectral width and the theoretical results are basically the same.