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对目标在回路(TIL)光纤激光阵列自适应锁相技术开展了理论与实验研究。介绍了目标在回路自适应锁相光纤激光阵列的基本结构和单抖动法的基本原理。搭建了两路高功率光纤放大器,利用信号处理器执行单抖动算法,实时控制光束的相位,实现了两路10 W级光纤放大器的目标在回路自适应相位锁定。实验结果表明,目标在回路自适应锁相光学系统能够有效控制光纤激光的相位噪声,实现阵列光束的相位锁定,光斑对比度可提高到73%。
The theoretical and experimental research on adaptive phase locking technology of target in-the-loop (TIL) fiber laser arrays is carried out. The basic principle and principle of single-jitter method are introduced in this paper. Two high-power optical fiber amplifiers are set up. The single-jitter algorithm is implemented by the signal processor to control the phase of the light beam in real time. Thus, the target of two 10-W optical fiber amplifiers is adaptively locked in the loop. The experimental results show that the target adaptive loop-locked optical system can effectively control the phase noise of the fiber laser and achieve phase locking of the array beam, and the spot contrast can be increased to 73%.