激光加工用5kW光纤耦合半导体激光器  

5 kW fiber coupling diode laser for laser processing

作　　者：刘友强[1] 曹银花[1] 李景[1] 邱运涛[1] 秦文斌[1] 王智勇[1] 王大勇[2] 杨光辉[1,3] 

机构地区：[1]北京工业大学激光工程研究院 [2]北京工业大学应用数理学院 [3]中国人民解放军96658部队

出　　处：《光学精密工程》2015年第5期1279-1287,共9页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.61006040);新世纪优秀人才支持计划资助项目(No.NCET-09-0002);北京市教委面上项目(No.KM201110005017);科研基地建设-科技创新平台-光纤激光器研究平台-高功率全光纤激光器的开发项目(No.PXM2011-014204-09-000060)

摘　　要：针对国内大功率半导体激光光纤耦合存在的问题,设计了光纤耦合聚焦系统,研制了5kW光纤耦合半导体激光器。比较了常见圆光斑光纤耦合与半导体激光方光斑光纤耦合的区别;对国产阵列型半导体激光堆栈,采用光束质量均匀化、偏振合束、多波长合束多路耦合等方式增加能量,将激光耦合进芯径为800μm,数值孔径(NA)为0.2的传能光纤中,实现了光纤耦合半导体激光输出光功率5 109W,光纤耦合效率85.69%,系统整体电光转换效率49.48%;在聚焦镜焦距为250mm时其激光功率密度达到2×105 W/cm2,可以用于金属的表面重熔、合金化、熔覆和焊接等领域。该激光器除了传能光纤外,其余部件均为为国产和自主研发,对我国国产高功率光纤耦合半导体激光器的开发具有重要的推动作用。To overcome the shortcomings of the optical fiber coupling of a domestic higher power diode laser,an optical fiber coupling focusing system was designed and a 5kW optical coupling diode laser was developed.The optical fiber coupling methods by common circle spot and diode laser squarespot were compared.For a domestic array diode laser stack,the optical quality homogenization,polarization beam bunching,multi-wavelength bunching were used to increase the energies,by which the laser can be coupled into the optical fiber with a core diameter of 800μm and a Numerical Aperture（NA）of 0.2.Thus,the fiber coupled output power reaches 5 109 W,the fiber coupling efficiency is85.69%,and the electro-optic conversion efficiency of overall system is 49.48%.Moreover,the power density reaches 2×10^5 W/cm2 when focal length is 250 mm.The laser has been used in multiwavelength surface remelting,metal alloying,laser cladding and laser welding fields.All the parts of the laser are made in China except the optical fiber for energy transfer,so it promotes the progress of higher power domestic optical fiber coupling lasers.

关 键 词：激光加工 半导体激光器 光纤耦合 激光焊接 激光熔覆 

分 类 号：TN248.4[电子电信—物理电子学] TG665[金属学及工艺—金属切削加工及机床]