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    • 摘要: 随着光纤激光相控阵技术向更多阵列单元发展,阵列光束间的指向误差成为影响光束合成效果的关键因素。针对基于光强梯度势阱的光束指向控制方法中光强梯度势阱调制片的制备难题,提出并采用光刻掩膜工艺制备基于环形条纹组合图样的光强梯度势阱调制片,实测光强透过率与设计值相符,归一化透过率的均方根误差为0.0166。基于随机并行梯度下降算法和自适应光纤准直器,通过仿真和实验手段实现扩展区域内光束指向误差的快速闭环校正,在平均光束指向误差约702.00 µrad的初始条件下,校正后的指向残差均值小于10.00 µrad。该研究为针对扩展目标的光束合成和激光指向控制提供重要参考。

       

      Abstract: With the advancement of phased fiber laser array technology toward more units, pointing errors between array beams have become a critical factor affecting beam combining performance. To address the challenges in fabricating light-intensity gradient trap modulation plates for beam pointing control based on light-intensity gradient traps, this paper proposes and employs a lithographic mask process to fabricate a light-intensity gradient trap modulation plate with annular stripe patterns. The measured light intensity transmittance aligns with the design value, and the root mean square error (RMSE) of the normalized transmittance is 0.0166. Through simulations and experiments, rapid correction of beam pointing errors in an extended area was achieved using the stochastic parallel gradient descent algorithm and an adaptive fiber-optics collimator. With an initial average beam pointing error of approximately 702 µrad, the mean residual pointing error after correction was reduced to less than 10 µrad. This research provides important references for laser pointing control and beam combining on extended targets.