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报道了一种利用100 ps啁啾脉冲堆积产生2．2 ns任意整形脉冲的脉冲整形系统。采用掺Yb~(3+)光纤锁模振荡器得到稳定的锁模光脉冲序列,将该锁模脉冲通过啁啾光纤光栅展宽并通过1 nm带宽的高斯形光谱滤波器滤波,得到标准的100 ps高斯形啁啾脉冲序列,将此脉冲选单经过光纤延迟线组成的32路脉冲堆积器,得到了精度为32 bit的重复频率为1 Hz的2．2 ns任意整形光脉冲。研究了堆积脉冲的特性,分析了宽带啁啾堆积整形脉冲的光谱时间扫描特性对激光驱动惯性约束聚变打靶束匀滑的优化作用。实验测得了该系统输出的2．2 ns整形光脉冲具有小于50 ps的上升沿,与100 ps啁啾脉冲的时间抖动小于4 ps。
A pulse shaping system that generates 2.2 ns arbitrary shaping pulses using a 100 ps chirped pulse stack is reported. A stable mode-locked pulse sequence was obtained by using Yb ~ (3 +) fiber mode-locked oscillator. The mode-locked pulse was broadened by chirped fiber grating and filtered by Gaussian spectral filter with 1 nm bandwidth to obtain the standard 100 ps Gaussian chirped pulse sequence. The 32-pulse accumulator with the pulse menu and fiber delay line was used to obtain a 2.2 ns arbitrary shaped light pulse with a precision of 32 bits and a repetition frequency of 1 Hz. The characteristics of stacked pulses are studied, and the optimization of spectral time-swept characteristics of broadband chirped buildup pulses on the laser-driven inertial confinement fusion target tracking uniformity is analyzed. The experimental results show that the 2.2 ns shaped optical pulse output by this system has a rising edge of less than 50 ps and the jitter of 100 ps chirped pulse is less than 4 ps.