从速率方程出发,建立了单点侧向泵浦掺Yb³⁺双包层光纤激光器的理论模型并进行了数值分析,得到了泵浦光方向分别为正向、反向、双向时,光纤内泵浦光和激光功率的分布特性及输出功率与泵浦点位置的变化关系.结果表明,相对于泵浦光正向或反向传输,当泵浦光双向传输时,光纤中的激光功率分布和输出激光功率受泵浦点的位置影响较小,对于侧向泵浦的双包层光纤激光器是较好的选择.

A theoretical model of one point side-pumped Yb³⁺ doped double clad fiber laser was built up. By numerical analysis, the distribution of pump power and laser power along the fiber, and the relation between pump position and output power were obtained for forward pump, backward pump and bidirectional pump. The results show that pump position has little effects on laser power distribution and output power for bidirectional pump. This method can become a good choice for side-pumped double clad fiber laser.