基于液相掺杂的低损耗近等厚芯层掺稀土光纤

过高的纤芯损耗和纤芯折射率非均匀性严重制约了掺稀土光纤在高功率光纤激光器中的应用,提出一种基于液相掺杂的低损耗近等厚芯层掺稀土光纤的工艺方法.结合改良的化学气相沉积(MCVD)溶液掺杂法制备了含有多层疏松层的掺稀土光纤预制棒,理论分析了光纤预制棒缩棒前、后芯层差的变化原理,采用流量递减沉积工艺降低了缩棒后不同芯层之间的...

Low loss near equal thickness core rare earth doped fiber based on liquid phase doping

The application of rare earth doped fiber in high power fiber laser is seriously restricted by high core loss and nonuniformity of core refractive index.A novel process method based on liquid phase doping for low loss near equal thickness core layer rare earth doped fiber is proposed.Based on the modified chemical vapor deposition(MCVD)solution doping method,rare earth doped optical fiber preform with multi-layer loose layer is prepared.The change principle of core layer difference before and after shrinking fiber preform is analyzed theoretically.The thickness difference between different core layers is reduced by flow decreasing deposition process,and the residual moisture content in multilayer loose layer was effectively reduced by optimizing dehydration process quantity.The experimental results show that the core loss of the prepared rare earth doped fiber is only 9.1 dB/km at 1380 nm,which effectively reduces the core loss and refractive index inhomogeneity of the rare earth doped fiber.