Zhang Mingqian, Zhi Dong, Ma Yanxing, Ma Pengfei, Su Rongtao, Wu Jian, Zhou Pu, Si Lei
Appl Opt. 2019 Feb 20;58(6):1491-1495. doi: 10.1364/AO.58.001491.
In this paper, we propose a design of coherent fiber-optics-array collimator (CFAC) that is mainly composed of a single unitary collimating lens and a prism. The CFAC system is presented conceptually, and corresponding parameters are theoretically analyzed using a geometrical optics method. Then, we set up a proof-of-concept experiment to verify the validity of the CFAC system with three coherent fiber lasers distributed along the symmetry axis through the center of the single unitary lens. After that, we realize the synchronous aberrationless collimating of the three beams with only one collimating lens system and their parallel propagation by utilizing a specific prism array. Finally, we successfully achieve a coherent beam combination of the laterally distributed three beams using a single-frequency dithering algorithm. Through an active piston phase control, the residual phase errors among the laser beams are suppressed below λ/26. By comparing the experimental results with the simulation results, we can see that the distribution of the closed-loop far-field intensity pattern detected by the charge-coupled infrared camera basically matches the ideal intensity distribution.
在本文中，我们提出了一种相干光纤阵列准直器（CFAC）的设计，它主要由一个整体式准直透镜和一个棱镜组成。从概念上介绍了CFAC系统，并使用几何光学方法对相应参数进行了理论分析。然后，我们搭建了一个概念验证实验，通过沿对称轴分布在单个整体透镜中心的三个相干光纤激光器来验证CFAC系统的有效性。之后，我们利用特定的棱镜阵列，仅用一个准直透镜系统实现了三束光的同步无像差准直及其平行传播。最后，我们使用单频抖动算法成功实现了横向分布的三束光的相干光束合成。通过有源活塞相位控制，将激光束之间的残余相位误差抑制到λ/26以下。通过将实验结果与模拟结果进行比较，可以看出电荷耦合红外相机检测到的闭环远场强度图案的分布基本与理想强度分布相匹配。
