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The effect of cladding geometry on the absorption efficiency of double-clad fiber lasers

机译：包层几何形状对双包层光纤激光器吸收效率的影响

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In the present work, the inner cladding geometries of a typical double-clad fiber laser are studied and numerically simulated for different cladding shapes to obtain the maximum absorption efficiency for the pump beam. This is performed by using the ray tracing approach and dislocating the fiber core from the center to impose the asymmetry on the investigated geometries. The high absorption efficiency of similar to 94.5% was obtained for the optimized offset D-shaped double-clad fiber. The hexagonal shape is proposed as a new geometry for the inner cladding to attain higher absorption efficiency. It was found that the absorption efficiency of similar to 68% for a symmetrical hexagonal can be improved to similar to 95% for an asymmetrized hexagonal-shaped double-clad fiber laser. Eventually the genetic algorithm was used to enhance the performance of the investigated geometries. This resulted in the further increasing of pump beam absorption efficiency of 99.5% in the genetic algorithm optimized asymmetrized hexagonal shape.
机译：在目前的工作中，研究了典型的双包层光纤激光器的内包层几何形状，并针对不同的包层形状进行了数值模拟，以获得泵浦光束的最大吸收效率。这是通过使用光线跟踪方法并将光纤纤芯从中心移开以将不对称性强加于所研究的几何形状来执行的。对于优化的偏置D形双包层光纤，获得了接近94.5％的高吸收效率。六角形被提议作为内包层的一种新的几何形状，以获得更高的吸收效率。已经发现，对于对称的六边形，近似68％的吸收效率可以提高到对于不对称的六边形双包层光纤激光器，近似为95％。最终，遗传算法被用于增强所研究几何的性能。在优化的不对称六边形遗传算法中，泵浦光束的吸收效率进一步提高了99.5％。

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