基于微透镜阵外腔的光纤激光谱组束耦合效率分析  

Analysis on coupling efficiency of external cavity-based spectral beam combination system with microlens array

作　　者：张茜[1] 吴卓亮[1] 赵尚弘[1] 楚兴春[1] 占生宝[1] 李云霞[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《红外与激光工程》2012年第4期901-905,912,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(60678018)

摘　　要：为了克服光纤激光外腔谱组束系统中增益带宽和透镜像差对组束阵元数量的限制,在系统中加入了微透镜阵。根据光束变换理论,建立了基于微透镜阵的光纤激光外腔谱组束系统的外腔耦合效率分析模型。通过数值模拟,对各种相关参数对耦合效率的影响进行了仿真分析。结果表明:微透镜阵的加入极大提高了阵元的耦合效率和系统的组束潜力;为了获得尽可能高的耦合效率,需要对离焦量进行合理配置并设计具有较长焦距的微透镜;横向对准误差是影响耦合效率的主要因素,对于宽度为10 mm的组束光纤阵列,为保证60%以上的耦合效率,在θy≤2 mrad的同时需将横向位置偏移量δy限制在10μm以内。In order to solve the problem that the array element amount available in fiber laser spectral beam combining system was limited by the gain bandwidth and the lens aberration,microlens array was incorporated in the beam combining system.On basis of beam transform theory,the theoretical model for analyzing the external cavity coupling efficiency of spectral beam combining system with microlens array was established.The influences of relevant system parameters on coupling efficiency were analyzed via numerical simulation.The results show that the coupling efficiency can be improved significantly due to the microlens array,and the combining potential of the system is advanced.The defocus value must be chosen reasonably and relatively longer focal length microlens should be designed for obtaining coupling efficiency as high as possible.Transverse alignment error is the main factor influencing the coupling efficiency.For an array with 10 mm size,to ensure the coupling efficiency higher than 60%,the transverse offset δy must be limited less than 10 μm with the precondition that the angle offset is less than 2 mrad.

关 键 词：光纤激光器 谱组束 外腔 微透镜阵 耦合效率 

分 类 号：TN248.1[电子电信—物理电子学]