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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 overcome the limitation of gain bandwidth and lens aberration on the number of beam array elements in the fiber laser system, a microlens array is added to the system. According to the theory of beam transformation, an analysis model of the coupling efficiency of external cavity of fiber laser based on microlens array is established. Through the numerical simulation, the influence of various related parameters on the coupling efficiency was simulated and analyzed. The results show that the micro lens array greatly increases the coupling efficiency of the array element and the potential of the system. In order to obtain the highest possible coupling efficiency, it is necessary to rationally configure the amount of defocus and design a micro lens with a long focal length ; Lateral alignment error is the main factor affecting the coupling efficiency. For a bundle optical fiber array with a width of 10 mm, in order to ensure the coupling efficiency of more than 60%, the lateral position offset δy should be limited to θy≤2 mrad Within 10μm.