啁啾脉冲堆积用于光脉冲整形

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。

Optical Pulse Shaping by Clirped Pulse Stacking

We demonstrate an all-fiber pulse shaping system that can generate 2.2 ns pulses with arbitrary pulse shapes by stacking a set of 100 ps chirped pulses.To form the standard 100 ps chirped Gaussian pulses,stable pulses generated from an Yb~(3 )-doped mode-locked fiber oscillator is stretched and filtered by a chirped fiber Bragg grating (CFBG) and a 1 nm Gaussian spectral filter.The standard pulse is selected and stacked in an all-fiber pulse stacker composed of 32 time delay lines,and a 2.2 ns arbitrarily shaped pulse with 32 bit shaping precision operating at 1 Hz rate is obtained.The characteristics of the stacked pulse are studied,and the analysis shows that the wide spectrum of shaped pulses which periodically sweeps from long wavelength to short wavelength may optimize the beam smoothing in inertial confined fusion (ICF).Experimental results shows the shaped 2.2 ns pulse has a rise time less than 50 ps,and it is precisely synchronized with the 100 ps pulse with time jitter less than 4 ps.