Firstov Sergei, Kharakhordin Alexander, Alyshev Sergey, Riumkin Konstantin, Firstova Elena, Melkumov Mikhail, Khopin Vladimir, Guryanov Alexey, Dianov Evgeny
Opt Express. 2018 May 14;26(10):12363-12371. doi: 10.1364/OE.26.012363.
The effect of thermal annealing on the luminescent and laser properties of high-germania-core silicate fibers doped with bismuth was investigated. We studied the behavior of optical absorption assigned to the bismuth-related active centers associated with germanium as well as the behavior of unsaturable absorption in annealed fibers with respect to the Bi content. The dependence of the increment of the active center content on the Bi concentration in the annealed fibers was obtained. We achieved laser oscillations near a wavelength of 1700 nm with a slope efficiency of 18% using a 8.5 m long Bi-doped fiber. The comparison of the output parameters of the laser based on an annealed Bi-doped fiber with the ones of a pristine Bi-doped fiber laser is given. The performance of the obtained bismuth-doped fiber lasers was modeled using the propagation and rate equations of a homogeneous quasi-two-level laser medium. Theoretical results are compared with experimental ones.
研究了热退火对掺铋高锗芯硅酸盐光纤发光和激光特性的影响。我们研究了与锗相关的铋相关活性中心的光吸收行为，以及退火光纤中不饱和吸收相对于铋含量的行为。得到了退火光纤中活性中心含量增量与铋浓度的关系。使用一根8.5米长的掺铋光纤，在1700纳米波长附近实现了斜率效率为18%的激光振荡。给出了基于退火掺铋光纤的激光器与原始掺铋光纤激光器输出参数的比较。利用均匀准二能级激光介质的传播和速率方程对所获得的掺铋光纤激光器的性能进行了建模。将理论结果与实验结果进行了比较。
