College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, 410073, China.
Opt Lett. 2011 Aug 15;36(16):3121-3. doi: 10.1364/OL.36.003121.
We demonstrated active phase locking a nine-element 1.1 kW all-fiber master-oscillator power amplifier (MOPA) array using the stochastic parallel gradient descent (SPGD) blind optimization algorithm. Two spectrally combined single-frequency seed lasers, which provide potential ability to suppress the stimulated Brillouin scattering effect, are employed as a master oscillator for the nine MOPA channels. The nine laser beams are tiled side by side into a 3×3 laser array with a fill factor of 40% in the near field. When the SPGD controller is enabled, the metric function is increased 4.1 times, and a visibility more than 90% of the interference pattern at the receiving plane is obtained. The computed phase residual error is less than λ/15, despite the phase fluctuation of each channel.
我们使用随机并行梯度下降（SPGD）盲优化算法演示了九单元 1.1kW 全光纤主振荡器功率放大器（MOPA）阵列的主动相位锁定。两个光谱组合的单频种子激光器用作九个 MOPA 通道的主振荡器，它们提供了抑制受激布里渊散射效应的潜力。九个激光束并排平铺成一个近场填充因子为 40%的 3×3 激光阵列。当启用 SPGD 控制器时，度量函数增加了 4.1 倍，并且在接收平面上获得了超过 90%的干涉图样的可见度。尽管每个通道的相位波动，计算出的相位残余误差仍小于 λ/15。
