高功率光纤端帽实现6kW激光输出

高功率光纤端帽是kW级光纤激光器必不可少的器件,而实现光纤端帽的低损耗高强度熔接是其关键技术。由于光纤和大尺寸光纤端帽在直径上的巨大差异,二者的熔接不能通过传统熔接机实现。设计并搭建了光纤端帽熔接系统,掌握了多种尺寸的光纤端帽的熔接工艺,成功用于光纤激光器及光纤合束器的高功率输出。实验上利用单模光端帽实现了3.01kW的激光输出,在未进行主动制冷的情况下温升为7℃/kW。利用多模光纤端帽实现了6.08kW的激光输出,在未进行主动制冷的情况下温升为6℃/kW。

High power fiber end-cap with 6 kW output power

High power fiber end-cap is an essential component for kW-level fiber lasers, the key technique of which is the splicing of fiber end-caps with low loss and high tension strength. Due to the huge difference of the diameters of fiber and large-size end-cap, the splicing of them cannot be realized by traditional fusion splicers. A fiber end-cap splicing system is designed and built. The splicing art is implemented for different size end-caps with good tension strength. Output power with 3.01 kW is realized with a single-mode fiber end-cap while only heating up by 7 ℃/kW without active cooling. Output power with 6.08 kW is realized with a multi-mode fiber end-cap while only heating up by 6 ℃/kW without active cooling.