强激光与粒子束, 2012, 24 (6): 1290, 网络出版: 2012-06-06
光纤激光相干合成高速高精度相位控制器
High-speed high-precision phase controller for coherent beam combining of fiber lasers
光纤激光器 相干合成 随机并行梯度下降算法 相位控制器 现场可编程逻辑阵列 fiber laser coherent beam combining stochastic parallel gradient descent algorithm phase controller FPGA
摘要
基于随机并行梯度下降算法（SPGD）和现场可编程逻辑阵列（FPGA）设计制作了相干合成（CBC）相位控制器。理论分析表明，该控制器单次迭代速率大于1.125 MHz，对于2路和16路相干合成，其平均控制带宽的理论值分别大于70 kHz和9 kHz，与现有的SPGD算法相位控制器相比有了量级上的提高。利用该控制器进行了验证性实验，表明该控制器能够实现高速高精度相位控制。当利用相位控制器对两路激光的相位进行锁定时，目标圆孔内能量提高了1.51倍，远场光斑对比度提高了5.29倍。
Abstract
A phase controller for coherent beam combining (CBC) of fiber lasers has been designed and manufactured based on stochastic parallel gradient descent (SPGD) algorithm and field programmable gate array (FPGA). Theoretical analysis shows that the iteration rate is more than 1.125 MHz, and the average compensation bandwidth of CBC of 2 or 16 channels is 70 or 9 kHz, respectively. The validation experiment shows that the phase controller can perform well in phase locking of lasers. When the phases of two lasers are locked by the phase controller, the energy encircled in the target enhances by a factor of 1.51, and the fringe visibility of the long exposure pattern increases by a factor of 5.29.
粟荣涛, 周朴, 王小林, 韩凯, 许晓军. 光纤激光相干合成高速高精度相位控制器[J]. 强激光与粒子束, 2012, 24(6): 1290. Su Rongtao, Zhou Pu, Wang Xiaolin, Han Kai, Xu Xiaojun. High-speed high-precision phase controller for coherent beam combining of fiber lasers[J]. High Power Laser and Particle Beams, 2012, 24(6): 1290.
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