多芯光纤激光器中共相位模式功率的提高

 以七芯光纤激光器为例，提出一种提高多芯光纤激光器总输出光功率中共相位模式所占比例的方法，即把多芯光纤激光器作为种子光源，输出信号光再经过多芯光纤放大器进行放大。基于速率方程组对激光器和放大器中的模式竞争进行了数值分析。计算表明：激光器输出端与放大器输入端之间距离存在一个最佳值，以使得放大器输出信号中低阶模式功率占总输出功率的比例最低，可以下降到小于1%。研究表明：级联放大系统可以有效增强共相位模式同时抑制低阶模式，比传统的塔耳博特腔激光器具有更好的光束质量。

Enhancing in-phase supermode selection for multicore fiber laser

To improve in-phase supermode selection for 7-core fiber laser,a novel cascade system,which consists of a multicore fiber laser as the seeding signal source and a multicore fiber amplifier,was proposed.The transverse supermode competition was analyzed based on a set of rate equations.The ratio of the power of the lower-order modes to the total output power can be reduced to less than 1%,with the optimum distance between the output end of the fiber laser and the input end of fiber amplifier.The results show that the cascade system can improve in-phase supermode selection effectively,which ensures much better beam quality,compared to the multicore fiber lasers with single Talbot cavity.