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为了实现多芯光纤激光器的单模输出,提出一种新的选模机制,即利用单模光纤进行选模。采用单模光纤和全反镜相结合作为选模器件,可以使6芯光纤激光器中同相位超模的耦合效率远远大于其他高阶超模,从而使高阶超模得到有效的抑制,实现高亮度的同相位超模单模输出。为了提高同相位超模的耦合效率,可以进一步优化单模光纤纤芯尺寸,同时调节单模光纤和6芯光纤之间的间隙距离。将同相位超模的耦合效率代入速率方程进行理论模拟,证明输出功率和耦合效率之间的必然联系,结果显示同相位超模输出功率随着耦合效率的增大而增大,得到单模输出的最大光-光转换效率为63.7%。
In order to realize single-mode output of multi-core fiber laser, a new mode selection mechanism is proposed, that is, single-mode fiber is used for mode selection. The combination of single-mode fiber and omnidirectional mirror as the mode selection device can make the coupling efficiency of the same-phase supermodule in 6-core fiber laser far greater than that of other high-order supermodules, so as to effectively suppress the high-order supermodules and achieve high brightness Phase supermode single mode output. In order to improve the coupling efficiency with the phase supermodules, the single-mode fiber core size can be further optimized, and the gap distance between the single-mode fiber and the 6-core fiber can be adjusted at the same time. The coupling efficiency of the in-phase supermodel is substituted into the rate equation for theoretical simulation to prove the inevitable connection between the output power and the coupling efficiency. The results show that the output power of the in-phase supermodules increases with the increase of the coupling efficiency and the single-mode output The maximum light-to-light conversion efficiency was 63.7%.