The coherent propagation and amplification of high-power laser radiation in a multicore fiber consisting of a square array of weakly bound cores are studied. Exact stable analytical solutions are found for the out-of-phase mode, which describes the coherent propagation of wave beams in such fibers. The analytical results are confirmed by direct numerical simulation of the wave equation. The stability conditions of the out-of-phase mode in the active medium are found.

中文翻译：

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矩形芯阵列中多芯光纤中高功率激光辐射的相干放大

研究了高功率激光辐射在多芯光纤中的相干传播和放大问题，该多芯光纤由方形阵列的弱束缚纤芯组成。对于异相模式，找到了精确的稳定解析解，该解描述了光束在此类光纤中的相干传播。分析结果通过波动方程的直接数值模拟得到证实。找到了活性介质中异相模式的稳定性条件。