双包层掺Bi光纤的制备及其光谱特性研究  

Preparation and spectral characteristics of Bi-doped double cladding fiber

作　　者：王岩山[1] 蒋作文[1] 栾怀训[1] 张泽学[1] 彭景刚[1] 杨旅云[1] 李进延[1] 戴能利[1] 

机构地区：[1]华中科技大学光电子科学与工程学院,武汉430074

出　　处：《物理学报》2012年第8期277-281,共5页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2011AA030201)资助的课题~~

摘　　要：用改进的化学气相沉积方法和溶液掺杂方法制备了掺Bi双包层石英基光纤.测试了掺Bi光纤预制棒切片的吸收光谱和掺Bi光纤在特定波长下的吸收系数,在不同波长的激光激发下,研究了掺Bi光纤的近红外荧光光谱.掺Bi光纤在976 nm激光激发下,其荧光光谱范围在1000-1400 nm之间,荧光峰的峰值位于1140 nm附近,半高宽约为130 nm;在793和808 nm激光激发下得到了1000-1700 nm的超宽带近红外荧光,半高宽超过250 nm.通过对掺Bi光纤预制棒切片进行900℃保温1 h的热处理后,发现在808 nm激光激发下预制棒切片的荧光强度增加了近4倍.研究结果表明,具有超宽带荧光特性的双包层掺Bi光纤有望作为超短脉冲激光器和可调谐激光器的增益介质.Bi-doped double cladding fiber preform is prepared by modified chemical vapor deposition and solution doping process. The absorption spectrum of preform and the near-infrared （NIR） luminescence spectrum of fiber are experimentally investigated. The luminescence spectrum of the fiber shows a peak emission band at 1140 nm with a full-width at half-maximum （FWHM） of 130 nm under 976 nm LD exciting. Under 808 or 793 nm LD exciting, an ultra-broad NIR emission with an FWHM of more than 250 nm is observed in the Bi-doped fiber, and the range of luminescence spectrum is from 1000 to 1700 nm. After the heat treatment of the Bi-doped fiber preform slice under 900 °C for 1 h, under 808 nm LD exciting, the fluorescence intensity is about 4 times higher than that of the perform slice without heat treatment. The results indicate that the Bi-doped double cladding fiber is a promising gain medium used for ultrashort fiber lasers and tunable fiber lasers.

关 键 词：掺Bi光纤 超宽带发光 双包层光纤 热处理 

分 类 号：TN248[电子电信—物理电子学]