【摘要】 为了实现高功率、高亮度的光纤激光输出,研究了新型多芯光纤组束技术,基于大模场倏逝波,采用时域有限差分数值模拟方法,对多芯光纤(包含多根微纳纤芯或包含多根微纳芯和大芯径纤芯)的模场特性进行了数值仿真和理论分析。结果表明,以一定方式排列的微纳光纤束阵列中多根微纳纤芯可以很好耦合;当多根微纳芯和大芯径纤芯组束时,微纳纤芯能够有效地平坦模场。这一结果对于高功率光纤激光器和放大器的进一步发展很有帮助。更多还原

【Abstract】 In order to achieve high-power and high-brightness fiber laser beams,based on the strong coupling mechanism of evanescent field,the modal field characteristics of multicore fibers,including a bundle of multiple micro/nano fibers or a bundle of multiple micro/nano fibers and large core fibers,were numerically simulated and theoretically analyzed with finite difference time domain (FDTD) method.The result shows that good coupling among the fibers can be obtained in a micro/nano fiber array and that the modal field is flattened by the micro/nano fibers in the bundle of multiple micro/nano fibers and large core fibers.The result is useful to further development of high-power lasers and amplifiers.更多还原