Ytterbium-doped fibers have become the optimum gain media of high-power fiber lasers thanks to a simple energy structure, which strongly reduces the excited state absorption, and a low quantum defect and a high optic–optic conversion efficiency, which means the low thermal load. In this paper, we take a review of the current state of the art in terms of $\text{Yb}^{3+}$ doped fibers for high-power fiber lasers, including the development of the fabrication techniques. The research work to overcome the challenges for $\text{Yb}^{3+}$ doped fibers, which affect the stability of output power and beam quality, will be demonstrated. Direction of further research is presented and the goal is to look for a fiber design, to boost single fiber output power, stabilize the laser power and support robust single-mode operation.

中文翻译：

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大功率掺杂光纤的发展与展望

掺镱光纤由于能量结构简单，大大降低了激发态吸收，低量子缺陷和高光-光转换效率，这意味着低热加载。在本文中，我们从以下方面回顾了当前的技术状态$\文本{Yb}^{3+}$用于高功率光纤激光器的掺杂光纤，包括制造技术的发展。克服挑战的研究工作$\文本{Yb}^{3+}$将展示影响输出功率稳定性和光束质量的掺杂光纤。提出了进一步研究的方向，目标是寻找一种光纤设计，以提高单光纤输出功率、稳定激光功率并支持稳健的单模操作。