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为满足激光驱动惯性约束聚变(ICF)点火中高对比度整形脉冲波形测试的需求,基于多脉冲波形拼接的级联光电探测法,在神光III主机装置上开展了ns高功率激光脉冲波形高对比度测量的实验研究。利用具有截止饱和特性的超快光电探测器,在实验中对凹形脉冲深度进行多通道波形测试。实验结果显示,经过多脉冲拼接得到的凹形脉冲底部具有350:1的对比度,远大于单通道单脉冲波形30:1的对比度。
In order to meet the demand of high contrast shaping pulse waveform test in laser driven inertial confinement fusion (ICF) ignition, a high contrast laser pulse waveform of ns high-power laser pulse waveform was implemented in SG-III host device based on the cascade photoelectric detection method of multi-pulse waveform mosaic Experimental study. Multi-channel waveform testing of the concave pulse depth was performed experimentally using an ultrafast photodetector with cutoff saturation characteristics. The experimental results show that the concavity of the concave pulse after multi-pulse splicing has the contrast ratio of 350: 1 which is much larger than that of the single-channel single-pulse waveform of 30: 1.