基于公共环形腔耦合的光纤激光器相干合成技术

Coherent beam combining of fiber lasers based on common ring cavity coupling configuration

为提高光纤激光器无源自调整相干合成阵列的效率、稳定性和可扩展性,提出了基于公共光纤环形腔耦合与单模光纤滤波的光纤激光器相干合成方案。将多个2×2的光纤耦合器分别插入各单元激光器的谐振腔,利用耦合器余下的端口,两两相连构成公共环形耦合腔。采用单模光纤滤波技术,提高了各输出激光束之间相位锁定的稳定性。利用该方案在实验上实现了三路光纤激光器的被动锁相输出,实验测得的远场干涉光斑、输出功率及光谱均表明该方案适于构建性能较好的光纤激光器相干合成阵列。

To improve the combining efficiency,stability and expandability of passive self-adjusting coherent combining arrays of fiber lasers,a novel coherent beam combining scheme of fiber lasers is proposed based on a common ring coupled cavity and single mode fiber filtering.Multiple 2×2 fiber couplers are inserted into the resonators of component fiber lasers,respectively,and the remaining ports of the fiber couplers are connected with each other to form the common ring coupled cavity.All the fiber lasers can realize efficient mutual injection coupling through the common ring cavity,and therefore phase locking output can be achieved.The stability of phase locking among the emitting laser beams is improved by the single mode fiber filtering technique.Passive phase locking of three fiber lasers with this configuration is demonstrated in experiment,and the recorded far-field patterns,output powers and spectra all indicate that it is a feasible scheme to construct the coherent array of fiber lasers with good performance.