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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
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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976nm激光激发下，其荧光光谱范围在1000-1400nm之间，荧光峰的峰值位于1140nm附近，半高宽约为130nm；在793和808nm激光激发下得到了1000-1700nm的超宽带近红外荧光，半高宽超过250nm．通过对掺Bi光纤预制棒切片进行900°C保温1h的热处理后，发现在808nm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．Abstract: 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.
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