Yuefang Yan, Yu Liu, Haoyu Zhang, Yue Li, Yuwei Li, Xi Feng, Donglin Yan, Jianjun Wang, Honghuan Lin, Feng Jing, Wenhui Huang, Rumao Tao. Principle and numerical demonstration of high power all-fiber coherent beam combination based on self-imaging effect in a square core fiber[J]. Photonics Research, 2022, 10(2): 444