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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.“,”For the requirements of the measurement of the high-contrast shaped pulse Inertial Confinement Fusion(ICF) based on the cascaded photodetection of multiple pulses, experimental research on high-contrast measurement for ns high-power laser pulse is developed at SG-III laser system. Using the ultra-fast photodetector, the bottom of a concave pulse is measured through multi-channels in experiment. The experimental results show that the concave pulse obtained by the multi-pulses joint is of the contrast of 350:1 better than 30:1 obtained through single channel.