提出了基于2种新型子孔径形状的填充方案,相较于传统圆形子孔径正六边形排列填充方案,所提方案能获得更高的面积填充占比。通过评估相干合成的远场光束质量,权衡光束截断导致的能量损耗与占空比改善带来的光束质量提升,计算得到最优解。仿真结果表明,相比于圆形子孔径正六边形排列填充方案,所提2种方案能将远场桶中功率占比分别提升9.2%和13.9%。所提孔径填充优化方案对提高光纤激光阵列分孔径相干合成效率具有一定的指导意义。

Two filling schemes based on new sub-aperture shapes are proposed, which can achieve a higher area filling ratio than that for the filling scheme based on a hexagonal close-packed array with traditional circular sub-apertures. By the evaluation of the far-field beam quality and the balance between the energy loss caused by beam truncation and the beam quality improvement by filling factor improvement, an optimal solution is obtained. The simulation results show that these two new schemes can increase the proportion of power in the far field bucket by 9.2% and 13.9% comparing with those based on a hexagonal close-packed array with circular sub-apertures. The proposed aperture filling optimization schemes have some guidance value for increasing the efficiency of tiled-aperture coherent beam combining of fiber laser arrays.