中央凹陷优化大模场面积光纤的计算与设计

Central-Dip-Optimized Large-Mode-Area Fiber Design and Calculation

为了设计性能更好的高功率光纤激光器,提出并在数值上优化了一个20/400μm的中央折射率凹陷的阶跃型光纤。中央折射率凹陷深度为0.0005,直径为5μm,使1064nm光纤的基本模式有效面积增加了12%。结果表明,有中央折射率凹陷的20/400μm阶跃型光纤适用于高功率光纤激光器。

To develop better high power fiber laser,we proposed and numerically optimized a 20/400μm step-index fiber with central index dip. Central index dip with depth of 0. 0005 and diameter of 5μm makes the fundamental mode Aeff increase by 12% at 1064 nm. The results indicate 20/400μm SIF fiber with central index dip（ CID） is suitable for high power fiber laser.