3 × 1 fiber signal combiner with high beam quality Gaussian-like beam for a 10kW-level fiber laser

作者：Yanyan Zhou, Aibi Yang, Guanghua Yang, Qiang Qiu, Xu Zhang, Zhilun Zhang, Yinbin Xing, Jinggang Peng, Haiqing Li, Yingbo Chu, Jinyan Li, Nengli Dai · 发表于：Optics Express · 年份：2022 · DOI：10.1364/oe.475281 · 被引用次数：9 · 研究领域：Photonic Crystal and Fiber Optics、Advanced Fiber Optic Sensors、Advanced Fiber Laser Technologies

We present the design and fabrication of a 3 × 1 signal combiner with high beam quality based on supermode theory. For improving beam quality, the fiber with core diameter of 34 µm and numerical aperture of 0.11 is first chosen as the output fiber. An 8.89 kW output laser with a power transmission efficiency of 97.2% and a low temperature rise coefficient of 3.5 °C/ kW at >8 kW is obtained when the combiner launched by three Yb-doped fiber lasers. In addition, the energy density distribution of the output beam is Gaussian-like and M 2 factor is 2.32, which is the best beam quality compared with the presented signal combiners for high power laser to the best of our knowledge.