976nm光抽运掺Er^(3+)二氧化硅微球产生激光的研究  

Study of Laser Emission from Er^(3+)-Doped Silica Microsphere Pumped by 976 nm Light

作　　者：郭长磊[1] 黄玉[1] 张培进[1] 黄衍堂[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350108

出　　处：《中国激光》2013年第3期18-22,共5页Chinese Journal of Lasers

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.

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 

分 类 号：TN248.4[电子电信—物理电子学]