Based on the pulse-shaping unit in the front end of high-power laser facilities, we propose a new hybrid scheme in a closed-loop control system including wavelet threshold denoising for pretreatment and a first derivative adaptive smoothing filter for smooth pulse recovery, so as to effectively restrain the influence of electrical noise and FM-to-AM modulation in the time–power curve, and enhance the calibration accuracy of the pulse shape in the feedback control system. The related simulation and experiment results show that the proposed scheme can obtain a better shaping effect on the high-contrast temporal shape in comparison with the cumulative average algorithm and orthogonal matching pursuit algorithm combined with a traditional smoothing filter. The implementation of the hybrid scheme mechanism increased the signal-to-noise ratio of the laser pulse from about 11 dB to 30 dB, and the filtered pulse is smooth without modulation, with smoothness of about 98.8%.

中文翻译：

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基于混合小波阈值去噪和一阶导数自适应平滑滤波的平滑脉冲恢复

基于大功率激光设备前端的脉冲整形单元，我们在闭环控制系统中提出了一种新的混合方案，包括用于预处理的小波阈值去噪和用于平滑脉冲恢复的一阶导数自适应平滑滤波器，因此以有效抑制电噪声和FM-to-AM调制对时间-功率曲线的影响，提高反馈控制系统中脉冲波形的校准精度。相关仿真和实验结果表明，与累积平均算法和正交匹配追踪算法结合传统平滑滤波器相比，所提方案对高对比度时间形状能获得更好的整形效果。