高功率大芯径环形光斑可调信号合束器的研究  

Ring Light Spot Adjustable Signal Combiner with High Power and LargeCore Diameter

作　　者：万志强 杨瑷碧 杨光华 于珊 胡紫晔 唐吉龙 魏志鹏[1] Wan Zhiqiang;Yang Aibi;Yang Guanghua;Yu Shan;Hu Ziye;Tang Jilong;Wei Zhipeng(State Key Laboratory of High Power Semiconductor Laser,Changchun University of Science and Technology,Changchun 130022,Jilin,China;Zhongshan Institute,Changchun University of Science and Technology,Zhongshan 528437,Guangdong,China;Shenzhen JPT Opto-electronics Co.,Ltd.,Shenzhen 518110,Guangdong,China)

机构地区：[1]长春理工大学高功率半导体激光国家重点实验室,吉林长春130022 [2]长春理工大学中山研究院,广东中山528437 [3]深圳市杰普特光电股份有限公司,广东深圳518110

出　　处：《中国激光》2024年第8期23-31,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(12074045,62027820);吉林省科技厅自然科学基金(20210101408JC,20230101352JC)。

摘　　要：针对传统高功率光纤激光器焊接不稳定、飞溅量大、难以实现精密焊接的问题,设计了一种光斑可调的信号合束器,首次以50μm/70μm/600μm/620μm/660μm大芯径环形双芯光纤作为输出光纤,基于光束非相干合成技术,通过RSoft软件对合束器进行了模拟仿真,分析了其模场变化情况,设计的合束器满足绝热拉锥以及亮度守恒两个原则,调控拉锥比(TR)使其可以实现中心和外环独立工作。采用套管法将7根25μm/250μm光纤耦合到一起形成熔锥光纤束,再将其与输出光纤进行熔接,制成了高功率大芯径环形光斑可调信号合束器。此光纤合束器的传输效率≥98%,中心光束质量因子(M2)仅为1.76,此时中心端口输出功率为3.036 kW。而后对合束器进行了耐环境测试,合束器在低温与高温下表现出的传输特性良好。将该光斑可调的环形光斑信号合束器应用到激光器中,通过调节中心和外环激光功率,可以在任何温度环境下实现超高速焊接,为激光复合焊接提供了一种新途径。Objective Adjustable-ring-mode fiber lasers hold significant application value in the field of lithium battery welding,with the fiber combiner serving as a pivotal component,playing a crucial role in improving the performance of these fiber lasers.Presently,there is a growing body of research dedicated to power improvement and beam quality optimization for signal combiners.This research predominantly revolves around modifying the number of input ports and varying the core diameter of the output fiber.Comparatively,there is a dearth of studies focusing on circular beam adjustable signal combiners.Compared with traditional high-power fiber lasers,the adjustable-ring-mode fiber laser can prevent spattering and improve welding stability.The performance of this combiner is such that the center and external ports can operate independently.Based on this working principle,a signal combiner featuring a large-corediameter output fiber is fabricated.This combiner attains exceptional transmission efficiency,superior beam quality,and remarkable resistance to high and low temperatures,rendering it suitable for the new field of lithium battery welding.Methods Utilizing beam incoherent synthesis technology,a simulation of the beam combiner is conducted using RSoft software.This simulation scrutinizes alterations in its mode field.The designed beam combiner satisfies the principles of adiabatic taper and brightness conservation.The relationship between the taper ratio and input fiber diameter is analyzed,delineating the range of taper ratio that ensures the autonomous operation of inner and outer ring fibers,even with different input fiber diameters.Considering the impact of cone size on cutting and welding processes,the cone size is determined,and the variations in the three mode fields under varying taper ratios are simulated and analyzed.Subsequently,the influence of the hydrofluoric acid solution concentration on the corrosion time and corrosion efficiency is studied,with pretreatment of the input fibers based on the research

关 键 词：激光器 光纤合束器 熔锥光纤束(TFB) 传输效率 光束质量 环境可靠性 

分 类 号：TN248[电子电信—物理电子学]