高功率连续光纤激光系统热效应及其抑制措施

热效应是影响高功率光纤激光系统安全运行的重要因素之一。探索光纤激光系统热效应产生的源头，积极开展热效应控制技术研究，采取合理措施抑制热集中现象，大幅提高光纤激光系统的模式不稳定阈值以避免模式劣化现象，对于进一步提升光纤激光系统安全稳定输出功率具有非常重要的现实意义。以广泛使用的端面集中泵浦技术为例，概述了高功率连续光纤激光系统的主要热效应来源，提出了针对不同热效应需要采取的解决方案与合理化建议。最后着重介绍了长距离分布式侧面泵浦技术和泵浦增益一体化复合功能激光光纤，展望了万瓦级超高功率光纤激光器的未来发展前景。

Thermal effect and its suppression in high-power continuous-wave fiber laser system

Thermal effect is one of the important factors affecting the safe operation of high-power fiber laser system. Exploring the source of thermal effect of optical fiber laser system, actively carrying out research on heat-control technology, taking reasonable measures to suppress heat concentration, and greatly improving the mode instability threshold of optical fiber laser system to avoid mode degradation, are of great practical significance to further improve the safe and stable output power of optical fiber laser system. Taking widely-used concentrated end-pumping technology as an example, this paper summarizes the main sources of thermal effect of high-power continuous-wave fiber laser system, and puts forward practical solutions and reasonable suggestions for different thermal effects. Finally, this paper focuses on long-distance distributed side-pumping technology and pump-gain integrated functional fiber, and looks forward to the future development of 10 kW-level ultra-high power fiber laser.