光学学报, 2020, 40 (6): 0632001, 网络出版: 2020-03-06
基于太赫兹调制的超快X射线脉冲长度复原方法 
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Algorithm to Reconstruct Ultra-Fast X-Ray Pulse Based on Terahertz Modulation
图 & 表
图 1. 太赫兹场调制FEL脉冲激发光电子物理过程原理示意图
Fig. 1. Schematic diagram for the principle of terahertz field modulated FEL induced photoelectron time and energy distribution
图 2. 延时分别为-60 fs,0 fs,60 fs时的模拟结果。(a)~(c)光电子终态能量与初态能量及时间延时的关系图;(d)~(f)光电子终态能谱分布图
Fig. 2. Simulation results with delays of -60 fs, 0 fs, and 60 fs. (a)-(c) Correlation in-between the terahertz streaked photoelectron final energy and initial energy at different time delays; (d)-(f) photoelectron final energy spectrum distribution
图 3. 不同长度的FEL脉冲在太赫兹矢势零点的光电子能谱分布图。(a)~(c)脉冲宽度分别为35 fs, 20 fs, 10 fs
Fig. 3. Photoelectron spectrum of FEL pulses with different lengths at the zero point of the terahertz vector potential. (a)-(c) Pulse length is 35 fs, 20 fs, and 10 fs respectively
图 4. 任意两FEL辐射脉冲在太赫兹矢势线性调制作用区间,各自中心能量在太赫兹矢势零点不同延时的变化示意图,两FEL脉宽分别为50 fs和35 fs。(a)双脉冲受太赫兹矢势调制作用示意图,其相对于矢势零点延时分别为-40 fs,70 fs;(b)图(a)的光电子能谱中心能量随延时变化示意图;(c)(d)双脉冲相对于矢势零点延迟分别为60 fs、30 fs时,太赫兹矢势调制作用示意图及电子能谱中心能量随延时变化示意图;(e)(f)双脉冲相对于矢势零点延迟分别为-90 fs、-30 fs的情况
Fig. 4. Schematic diagram for two arbitary FEL pulses with various mutual delays modulated by terahertz field near to the zero-crossing of its vector potential, where the pulse lengths are 50 fs and 35 fs. (a) Schematic diagram of double-pulse modulation by terahertz vector potential, when the double pulses are relative to the zero of terahertz vector potentials are -40 fs and 70 fs; (b) variation of center enegy of photoelectron spectrum with delays of double-pulse in Fig. (a); (c)(d) schematic diagram
图 5. 不同FEL脉冲偏离太赫兹矢势零点-100~100 fs延时范围内,复原结果与原脉宽之间的相对误差
Fig. 5. Relative errors between retrieval result and original FEL pulse in different lengths, deviated from the zero of terahertz vector potential from -100 fs to 100 fs
表 1不同FEL脉冲宽度的脉冲在不同延迟下的复原结果和调制能谱宽度展宽量
Table1. Retrieval results and modulation spectrum width spread of pulses with different FEL pulse widths at different delays
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表 25 fs的FEL脉冲在不同延时下的脉冲复原误差
Table2. Retrieval errors of 5 fs FEL pulse under different delays
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李成名, 李宾. 基于太赫兹调制的超快X射线脉冲长度复原方法[J]. 光学学报, 2020, 40(6): 0632001. Chengming Li, Bin Li. Algorithm to Reconstruct Ultra-Fast X-Ray Pulse Based on Terahertz Modulation[J]. Acta Optica Sinica, 2020, 40(6): 0632001.
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