基于二极管激光器mini-bar的光纤耦合方式是一种降低耦合系统成本并提高整体转换效率的方法,为此, 采用40片封装在铜微通道冷却器上的连续60 W二极管激光器mini-bar组成空间叠加阵列, 作为耦合光源, 采用非球面柱透镜及柱透镜阵列对mini-bar叠阵进行了快轴与慢轴的准直, 实现了两列叠阵的激光束沿快轴方向的空间合成以提高叠阵激光束的填充因子, 合成后的激光束可以耦合进入芯径为800 μm、数值孔径为0.22的光纤。测试结果表明, 光纤耦合模块输出功率最高为1360 W, 整体光光效率58%, 光纤端面的功率密度达到1.73×105 W/cm2。

The fiber coupled system based on mini-bars is an effective way of avoiding complex beam shaping to reduce costs and improve brightness. Forty mini-bars mounted on copper microchannel heatsink are arranged in two stacks to collimate the output beam of the stacks with the aspherical cylindrical lens and cylindrical lens array in fast and slow axis directions in this paper. For increasing the fill factor of the beams of the stacks, the beams are combined spatially in the fast axis direction. The combined beam could be coupled into the fiber of 800 μm core diameter and 0.22 numerical aperture. The opto-optical efficiency of the fiber coupled module is about 58% and the maximum output power is 1360 W with the power density of 1.73×105 W/cm2 at fiber output facet.