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针对物理实验要求的三台阶整形脉冲(脉冲宽度比为1.5 ns:1ns:0.5 ns,幅度比为1:4:16),在神光-Ⅲ原型(TIL)装置上开展了脉冲时间波形整形实验研究。首先,针对发射目标利用激光性能仿真模型预测注入激光系统的激光能量和脉冲波形。然后,在脉冲整形后进行不同功率的激光发射对脉冲波形进一步修正:利用实验测量的频率转换效率修正各光束1ω能量和1ω脉冲波形;通过拟合实验测量的能量数据修正注入激光能量;通过增益-通量曲线修正注入激光脉冲波形。最后,将各束注入脉冲波形再次折中作为脉冲波形调整的最终依据。实验结果表明,对靶面要求的3ω-3 ns-0.5 kJ(单束)的三台阶整形脉冲,8束脉冲波形与要求比较一致;三个台阶的束间瞬时均方根功率不平衡分别约为30%,10%和5%。
According to the requirements of physical experiments, three steps of shaping pulse (pulse width ratio 1.5 ns: 1 ns: 0.5 ns, amplitude ratio 1: 4: 16) the study. First of all, the laser energy and pulse shape of the laser system are predicted by using the laser performance simulation model for the launch target. Then, after pulse shaping, laser pulses of different powers are used to further correct the pulse waveforms: 1ω energy and 1ω pulse waveforms of each beam are corrected by experimentally measured frequency conversion efficiencies; the injected laser energy is modified by fitting experimentally measured energy data; - Flux curve correction injects laser pulse waveform. Finally, each beam injected into the pulse waveform compromise again as the final basis for the adjustment of the pulse waveform. The experimental results show that the three pulse trains with 3ω-3 ns-0.5 kJ (single beam) required for the target surface have the same requirements as the 8 pulse trains. The instantaneous rms power imbalance between the three beams is about 30%, 10% and 5%.