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依据耦合模理论分析了双包层多芯光子晶体光纤的超模模场特性,通过倏逝波对7束光的相位调节,可实现相干合成,激光亮度得到很大提高.利用相干合成原理对双包层多芯光子晶体光纤的出射光相干功率密度进行了分析与测量,对此种结构的光子晶体光纤实现自相干合成提出了理论和实验依据。
Based on the coupled-mode theory, the supermode field properties of double-clad multi-core photonic crystal fiber are analyzed. By adjusting the phase of the seven beams by evanescent wave, coherent combination can be realized and the laser brightness is greatly improved. The coherence power density of the double clad multicore photonic crystal fiber is analyzed and measured. Theoretical and experimental evidences for the self-coherent synthesis of this kind of photonic crystal fiber are proposed.