Precise laser pulse shaping technology and application with high energy stability
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摘要: 提出了基于激光脉冲波形精密调控和能量稳定性控制的双回路同步闭环设计方法，进而在任意波形发生器与预放大系统输出处建立脉冲波形闭环控制系统，在保偏大模场光纤放大器和再生放大器间建立能量稳定性闭环系统。依托大口径高通量实验平台，实现了激光脉冲波形的快速高稳定精密调控，脉冲波形闭环精度优于2%（RMS），脉冲能量稳定性优于5%（PV）。该技术成功应用到物理实验正式发射中，常规整形脉冲波形的功率准确度优于2%，相关结果有力支撑了ICF激光驱动器激光参数精密调控设计。Abstract: Double circuit synchronous closed-loop design based on precise laser pulse waveform shaping and energy stability control was introduced. A pulse shaping closed-loop control system was established between arbitrary waveform generator and the output of preamplifier system, and an energy stability closed-loop system was established between polarization large-mode-area fiber amplifier and the regenerative amplifier. The laser pulse’s precise shaping with high energy stability was demonstrated based on the Integration Test Bed. And the closed-loop accuracy of the pulse waveform was better than 2% (RMS), and the energy stability was better than 5% (PV). The results were successfully applied to the formal launch of physical experiments, and the power accuracy of the conventional shaping pulse waveform was better than 2%. The successful demonstration of the double circuit synchronous closed loop system strongly supports the precise control design of the laser parameters of laser driver for ICF.
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图 1 预放大系统的非线性时域响应特性
Figure 1. Nonlinear temporal response function of preamplifier system
图 2 再生放大器的不同工作状态对预放大系统输出的影响
Figure 2. Dependence of regenerative amplifier state on output of preamplifier system
图 3 脉冲波形精密调控闭环设计的原理示意图
Figure 3. Schematic of laser pulse precise shaping closed-loop feedback system
图 4 激光脉冲能量稳定性闭环控制原理示意图
Figure 4. Schematic of laser pulse energy closed-loop control system
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