Geng Chao, Li Feng, Zuo Jing, Liu Jiaying, Yang Xu, Yu Tao, Jiang Jiali, Li Xinyang
Opt Lett. 2020 Apr 1;45(7):1906-1909. doi: 10.1364/OL.383093.
In this Letter, we propose and demonstrate efficient adaptive optics correction of a distributed 19-element fiber laser array for both receiving and transmission for the first time, to our best knowledge. Active beam coupling from space into polarization-maintaining fibers and all-fiber active cophasing beam combining with multiple-level fiber couplers are performed. Phase distortions distributed throughout the optical path from the simulated target to the receiving port are eliminated, and nearly ideal coherent combining is achieved in the far-field. Comprehensive reception efficiency is raised up to 52 times with the whole equivalent aperture of 152 mm and the far-field power-in-the-bucket metric up to 8.27 times. The optimal array element parameters for a given whole array aperture and turbulence intensity are analyzed.
据我们所知，在本信函中，我们首次提出并演示了一种用于接收和传输的分布式19元光纤激光器阵列的高效自适应光学校正。实现了从空间到保偏光纤的有源光束耦合以及使用多级光纤耦合器的全光纤有源同相光束合成。消除了从模拟目标到接收端口的整个光路中分布的相位畸变，并在远场实现了近乎理想的相干合成。在等效孔径为152毫米的情况下，综合接收效率提高了52倍，远场桶中功率指标提高了8.27倍。分析了给定整个阵列孔径和湍流强度下的最佳阵列元件参数。
