侧面泵浦大功率双包层光纤激光器的双凹槽金属二元光栅
Efficient side pumping of high-ower fiber lasers using doubly grooved binary metallic diffraction gratings
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摘要: 将双凹槽金属二元光栅用于侧面泵浦大功率双包层光纤激光器中,这种具有等槽深、不等线宽的双凹槽金属二元光栅可以被直接制作在双包层光纤的侧面内包层上，以实现大功率的激光泵浦。通过选择梯度优化算法（如拟牛顿算法）和微型遗传算法准确地预测出：利用这种双凹槽金属二元光栅结构能实现对TE偏振光的耦合效率为77.27%，而对TM偏振光的耦合效率为94.77%。同时，也对这种结构的制作容差和最小特征尺寸进行了分析和计算。Abstract: A metallic binary grating with two grooves per period, defined by different linewidths and the same depth, is applied to side-pumping high power fiber lasers for the first time. This kind of doubly grooved metallic grating can be fabricated directly on inner clad of double-clad fiber and so that it can be used for high-power laser pumping. By combining a gradient algorithm (quasi-Newton methods) and micro- genetic algorithm, the grating is optimized and the maximum coupling efficiencies of 94.77% and 77.27% for TM and TE polarization waves respectively are demonstrated. Meanwhile, the fabrication-error and the minimum feature size of grating are also analyzed.
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Key words:
- fiber laser /
- double-clad fiber /
- metal diffraction grating /
- coupling efficiency
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