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采用电极放电高温熔融沾有一定浓度硝酸铒溶液的石英单锥细纤,熔融状态二氧化硅在自身表面张力作用下形成表面光滑的微球,进而实现了掺Er3+微球的制备。利用掺Er3+二氧化硅微球谐振器与双锥光纤的倏逝波近场耦合,把976nm单模激光耦合入微球的高功率密度回音壁模式(WGM)进而抽运激发掺入微球表面的Er3+,能级跃迁产生位于光纤通信中C+L波段的下转换发光光谱,并在1555nm和1600nm附近测得了单纵模和多纵模激光。实验测试微球直径为70～150μm不等,所用硝酸铒溶液浓度为10-5～10-4 mol/mL。这种微球制备及稀土掺杂方法简单易行,重复性好,也便于稀土掺杂材料发光的研究。
The fused silica with a certain concentration of erbium nitrate solution was melted by electrode discharge at high temperature. The melted silica formed microspheres with smooth surface under its own surface tension, and then the Er3 + -doped microspheres were prepared. The coupling of 976nm single-mode laser into the high-power-density whispering gallery (WGM) of the microspheres by pumping near-evanescent field coupling of the Er3 + -doped silica microsphere resonator and the biconical fiber, Er3 +, the level transition produces a down-converted luminescence spectrum in the C + L band in optical fiber communication and single-longitudinal mode and multi-longitudinal mode lasers are measured around 1555 nm and 1600 nm. The diameters of the microspheres in the experiment are ranging from 70 to 150 μm, and the erbium nitrate solution used is 10 -5 to 10 -4 mol / mL. The preparation method of the microsphere and the rare earth doping method are simple and easy, the repeatability is good, and the luminescence of the rare earth doping material is also facilitated.