针对线阵光纤激光相干合成系统中对合成光束的质量、控制速度、控制精度的需求, 完成了线阵光纤激光相干合成控制器的设计。该控制器以DSP2812和CPLD为核心处理器, 通过AD976A模/数转换器接收光电探测器的电压信号, AD8544数/模转换器输出模拟电压控制压电陶瓷相位控制器, 进而控制激光的相位变化。为了实现控制器与目标图像检测板和上位机的通信, 设计了两路串口通信接口, 并编写了相关测试程序, 最终在线阵光纤激光相干合成系统中完成了四路1 064 nm激光的相干合成、扫描、跟踪实验。实验结果表明, 该控制器搭载随机并行梯度下降(SPGD)算法, 在光电探测器的配合下能够实现光纤激光锁相, 控制主瓣能量变化优于±5%, 锁相后主瓣能够完成±λ的扫描, 扫描频率约为25 Hz, 同时结合目标图像检测板完成了目标跟踪实验, 实现激光相干合成条纹的目标跟踪。

Aiming at the requirements of the quality, control speed and control accuracy of the synthetic beam in the linear array fiber laser coherent synthesis system, the design of the linear array fiber laser coherent synthesis controller is completed. The controller uses DSP2812 and CPLD as the core processor, receives the voltage signal of the photodetector through AD976A analog-to-digital converter, and outputs analog voltage from AD8544 digital to analog converter to control the piezoelectric ceramic phase controller, and then controls the phase change of the light. In order to realize the communication between the controller and the target image detection board and the upper computer, two serial communication interfaces are designed, and related test procedures have been written. Finally, the coherent synthesis, scanning and tracking experiments of four 1 064 nm lasers are completed in the linear array fiber laser coherent synthesis system. The experimental results show that the controller is equipped with SPGD algorithm, and can realize fiber laser phase locked with the cooperation of photodetectors. After phase locked, the energy change of the main lobe is better than ± 5%, and the scanned range of the main lobe is ± λ. The scanned frequency is about 25 Hz. At the same time, the target tracked experiment is completed in combination with the target image detection board to realize the target tracked of laser coherent synthetic stripes.