摘要
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。
Er3＋-doped silica microspheres with smooth surface are fabricated through surface tension induced by heating and fusing a single tapered silica fiber between two discharge electrodes. The tapered fiber is dipped with quantitative erbium nitrate solution. Single mode laser of 976 nm is coupled into microsphere through near-field coupling by evanescent wave from biconical tapered fiber, exciting high power density whispering gallery modes （WGM） in the microsphere. And downconversion emission spectrum of C＋ L band of optical communication is obtained, which is emitted from stimulated Er3＋ distributing all over the surface of microsphere. Single-longitudinal- mode and multi-longitudinal-mode lasers are also measured at around 1555 nm and 1600 nm. The diameters of the microspheres tested in our experiment are between 70- 150 μm, and the concentration of the erbium nitrate solution is about 10-s- 10-4 mol/mL. The methods of microsphere fabrication and rare earth doping are simple and practicable for fast measurement of the luminescence of rare earth doped materials.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2013年第3期18-22,共5页
Chinese Journal of Lasers
关键词
激光器
下转换发光
掺Er3+二氧化硅微球
光纤通信
回音壁模式
lasers
downconversion light emission Er3＋-doped silica microsphere
optical fiber communication
whispering gallery mode
