The success of high-power fiber lasers is fueled by maturation of active and passive fibers,combined with the availability of high-power fiber-based components.In this contribution,we first overview the enormous poten...The success of high-power fiber lasers is fueled by maturation of active and passive fibers,combined with the availability of high-power fiber-based components.In this contribution,we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser systems.Subsequently,the emerging functional active and passive fibers in recent years,which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission,are outlined from the perspectives of geo-metric and material engineering.Finally,novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection,and correspondingly,the high-power progress of function fiber-based components in power handling are introduced,which suggest more flexible controllability on high-power laser operations.展开更多
正交模耦合器是反射面天线馈源系统中非常重要的无源器件,正交模耦合器的带宽决定了天线的工作带宽,其性能直接影响接收机的性能。为满足新疆天文台Q波段（30～50 GHz）制冷接收机的需求,描述了Turnstile结构的正交模耦合器,公共端口为...正交模耦合器是反射面天线馈源系统中非常重要的无源器件,正交模耦合器的带宽决定了天线的工作带宽,其性能直接影响接收机的性能。为满足新疆天文台Q波段（30～50 GHz）制冷接收机的需求,描述了Turnstile结构的正交模耦合器,公共端口为圆波导,2个分支端口为标准矩形波导。应用电磁仿真软件HFSS对正交模耦合器进行了设计与优化。仿真结果表明,在50%相对带宽内,回波损耗优于-22 d B,正交隔离度优于-46 d B。为进一步开展毫米波宽带OMT的研究提供了理论设计基础。展开更多
基金supported by the National Natural Science Foundation of China(No.62035015,No.61805280,No.62061136013)Innovation Group of Hunan Province,China(No.2019JJ10005)+1 种基金Hunan Innovative Province Construction Project,China(No.2019RS3017)the Research Plan of National University of Defense Technology(No.ZK19-07).
文摘The success of high-power fiber lasers is fueled by maturation of active and passive fibers,combined with the availability of high-power fiber-based components.In this contribution,we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser systems.Subsequently,the emerging functional active and passive fibers in recent years,which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission,are outlined from the perspectives of geo-metric and material engineering.Finally,novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection,and correspondingly,the high-power progress of function fiber-based components in power handling are introduced,which suggest more flexible controllability on high-power laser operations.
文摘正交模耦合器是反射面天线馈源系统中非常重要的无源器件,正交模耦合器的带宽决定了天线的工作带宽,其性能直接影响接收机的性能。为满足新疆天文台Q波段（30～50 GHz）制冷接收机的需求,描述了Turnstile结构的正交模耦合器,公共端口为圆波导,2个分支端口为标准矩形波导。应用电磁仿真软件HFSS对正交模耦合器进行了设计与优化。仿真结果表明,在50%相对带宽内,回波损耗优于-22 d B,正交隔离度优于-46 d B。为进一步开展毫米波宽带OMT的研究提供了理论设计基础。
