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要提高七芯光子晶体光纤激光器的输出功率,必须要增大七芯光子晶体光纤的有效模面积,并且需要纤芯间具有较强的耦合作用,以保证各纤芯输出的光束保持同相位。为了更直观的分析七芯光子晶体光纤的有效模场面积和纤芯间耦合强度的关系,根据七芯光子晶体光纤7个超模的特征,给出了七芯光子晶体光纤耦合长度的一种计算方法。利用多极法和有限差分光束传播法分析了七芯光子晶体光纤的结构对有效模场面积和耦合长度的影响。通过优化七芯光子晶体光纤的结构,设计了一种外层空气孔较大,内层空气孔较小的七芯光子晶体光纤,其有效模场面积高达3703μm2,耦合长度仅为13310μm。
To increase the output power of a seven-core photonic crystal fiber laser, the effective mode area of the seven-core photonic crystal fiber must be increased, and the strong coupling between the cores needs to be ensured to ensure that the output beams of the respective cores maintain the same phase. In order to more intuitively analyze the relationship between the effective mode field area and the inter-core coupling strength of seven-core photonic crystal fiber, according to the characteristics of seven supermodes of seven-core photonic crystal fiber, a coupling length of seven-core photonic crystal fiber Calculation method. The effect of the structure of the seven-core photonic crystal fiber on the effective mode field area and the coupling length was analyzed by multi-pole method and finite-difference beam propagation method. By optimizing the structure of the seven-core photonic crystal fiber, a seven-core photonic crystal fiber with a large outer-layer air hole and a small inner-layer air hole is designed. The effective mode field area is up to 3703 μm2 and the coupling length is only 13310 μm.