万瓦级激光光闸的热效应分析及处理

激光光闸可以将光纤激光器输出的单束激光通过多通道输出，实现激光器的“一机多用”，是现代化激光智能制造的关键性器件。由于光闸承载功率高达上万瓦，其耦合系统极易产生热效应，影响光闸使用性能。为解决万瓦级激光光闸热效应有效控制的难题，保证光闸的高效耦合与高质量光束输出，采用有限元分析法研究了光闸耦合系统的热效应物理机制，并提出一种基于水循环绕流冷却对光闸耦合系统进行热量管控的新方法。通过万瓦激光下的一系列实验验证，表明文中提出的热效应处理方法保证下，高功率激光光闸能长时间承载万瓦级功率，并保持98%以上的耦合效率，同时抑制了系统的热像差，保证了光闸输出激光的光束质量稳定性。该研究为高功率激光系统的热效应分析及处理提供了有效的手段。

Analysis and treatment of thermal effects in 10 kW-level optic switch

The optic switch can output the single laser beam output by the fiber laser through multiple channels to realize the "one device and multiple applications" of the laser. It is the key device of modern laser intelligent manufacturing. As the power of the optic switch is up to 10 kW level, thermal effects happen easily in the coupling system, which affects the performance of the optic switch. In order to solve the problem of effective control of thermal effects, ensure the efficient coupling and high-quality output of the 10 kW-level optic switch, the physical mechanism of thermal effects in the coupling system was studied by finite element analysis. And a novel method based on water circulation and flow around cooling was proposed to control the thermal effects of the system. Through the verification of serial 10 kW-level experiments, it indicated that under the guarantee of the method proposed in this paper, the high-power optic switch was able to carry 10 kW-level power for a long time. The coupling efficiency was maintained above 98%. The thermal aberration of the system was suppressed, and the stability of the beam quality of the laser output by the optic switch can be guaranteed. This study provides an effective means for the analysis and treatment of thermal effects in the high-power laser system.