Dong Lizhi, Wang Xun, Liu Wenjin, Chen Shanqiu, Liu Ziyue, Zhang Ying, Liu Ziyu, Huang Jian, Ning Yu, Yu Xin
Opt Lett. 2025 Feb 1;50(3):738-741. doi: 10.1364/OL.546149.
Tiled fiber laser arrays have attracted significant attention for their potential in power scaling and mitigation of atmospheric turbulence. In recent years, the capability to form multiple beams has been highly desirable across a variety of applications. However, existing tiled laser arrays have been limited to generating a single combined beam owing to optimization-based control algorithms. We present a novel approach for multi-beam formation using a tiled fiber laser array with closed-loop steering control. A tagging laser is divided and coupled into each beamlet. By modulating the sequence of the tagging laser pulses and synchronizing a far-field camera, the pointing of each beamlet is directly measured and individually controlled. The beamlets are then organized in groups, and the beamlets in each group are combined to a common position in the far field. Multiple beams can be formed on demand through corresponding group configurations. An experimental system comprising seven beamlets and an adaptive fiber collimator array achieved the formation of one, two, and three beams using the proposed method. To the best of our knowledge, this is the first demonstration of closed-loop multi-beam formation using a tiled fiber laser array.
平铺式光纤激光器阵列因其在功率扩展和减轻大气湍流方面的潜力而备受关注。近年来，在各种应用中形成多光束的能力一直是非常理想的。然而，由于基于优化的控制算法，现有的平铺式激光阵列仅限于产生单个组合光束。我们提出了一种使用具有闭环转向控制的平铺式光纤激光器阵列进行多光束形成的新方法。一个标记激光器被分割并耦合到每个子光束中。通过调制标记激光脉冲的序列并同步远场相机，可以直接测量并单独控制每个子光束的指向。然后将子光束分组，每组中的子光束在远场中组合到一个公共位置。通过相应的组配置可以按需形成多束光。一个包含七个子光束和一个自适应光纤准直器阵列的实验系统使用所提出的方法实现了一束、两束和三束光的形成。据我们所知，这是首次使用平铺式光纤激光器阵列进行闭环多光束形成的演示。
