纳秒脉冲掺镱全光纤激光器研究进展

掺镱全光纤纳秒脉冲激光器发展迅猛，已经为诸多领域开辟了新的道路，特别是高平均功率、大脉冲能量的纳秒脉冲光纤激光器在激光清洗等领域得到了广泛应用。多路光纤激光合束是实现高平均功率、大脉冲能量激光输出的主要手段，其结构复杂程度取决于单模块激光器的输出特性，提升单模块纳秒脉冲全光纤激光器输出特性对于激光清洗等领域具有重要意义。文中总结了单模块掺镱全光纤纳秒脉冲激光器的研究进展，分析了当前限制其功率和能量进一步提升的主要因素。首先，从主动调Q、被动调Q以及增益开关技术三个层面回顾了纳秒脉冲掺镱全光纤振荡器的研究进展；其次，从大脉冲能量、高平均功率、两者协同发展三个指标层面总结了纳秒脉冲掺镱全光纤放大器的研究现状；最后，从限制高指标掺镱全光纤激光器输出特性的因素出发，展望了其在未来功率和能量提升上的发展趋势。

Recent advances in nanosecond-pulsed Ytterbium-doped all-fiber lasers

Ytterbium-doped all-fiber nanosecond-pulsed lasers have developed rapidly in recent years and have opened up new horizons in many fields. Especially in the field of laser cleaning, there is a strong demand for nanosecond pulsed fiber laser with high-power and high-energy. Multi-channel fiber laser beam combining is the main means to achieve high-power and high-energy laser output. The complexity of the structure depends on the output characteristics of a monolithic laser. Improving the output characteristics of monolithic nanosecond pulsed all-fiber laser is very important for laser cleaning and other applications. In this paper, the research progress of monolithic Ytterbium-doped all-fiber nanosecond pulsed lasers is summarized, and the main factors that limit its power and energy expansion are analyzed. Firstly, the recent advances of nanosecond pulsed Ytterbium-doped all-fiber oscillator is reviewed with active Q-switching, passive Q-switching and gain-switching technology. Then, the research status of nanosecond pulse Ytterbium-doped all-fiber amplifiers is summarized with large pulse energy, high average power and collaborative development of the two. In the end, the development trend of Ytterbium-doped all-fiber laser in scaling of power and energy is prospected from the factors limiting the output characteristics.