College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha, China.
Opt Lett. 2011 Mar 15;36(6):951-3. doi: 10.1364/OL.36.000951.
Coherent beam combination of a 1.08 kW fiber amplifier array has been demonstrated for the first time, to our knowledge. In the experiment, nine fiber amplifiers are tiled into a 3×3 array, and the output power of each amplifier is approximately 120 W. A single frequency dithering algorithm is used to compensate the phase noises between the elements, which runs on a signal processor based on field programmable gate array for phase control on the fiber amplifiers. When the phase control system goes into closed loop, the fringe contrast of the far-field intensity pattern is improved to more than 85%, and the residual phase error is less than λ/15.
据我们所知，这是首次实现 1.08kW 光纤放大器阵列的相干光束组合。在实验中，将九个光纤放大器拼接成一个 3×3 的阵列，每个放大器的输出功率约为 120W。采用单频抖动算法来补偿各单元之间的相位噪声，该算法在基于现场可编程门阵列的信号处理器上运行，用于对光纤放大器进行相位控制。当相位控制系统进入闭环时，远场强度模式的条纹对比度提高到 85%以上，剩余相位误差小于λ/15。
