光学学报, 2018, 38 (9): 0932001, 网络出版: 2019-05-09
基于超快动力学模型的阿秒脉冲复原方法 
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Reconstruction Method of Attosecond Pulses Based on Ultrafast Dynamic Model
图 & 表
图 1. 基于阿秒条纹相机的光电子能谱测量装置示意图
Fig. 1. Schematic of photoelectron energy spectrum measurement based on attosecond streak camera
图 2. 超快动力学模型示意图。(a) 初始光电子波包的能量-时间分布;红外激光场延迟为0时的(b)阿秒脉冲初始能量分布和(c)光电子能谱;红外激光场延迟为0.667 fs时的(d)阿秒脉冲初始能量分布和(e)光电子能谱;(f)红外激光场的矢势随延迟时间的变化;(g)无红外激光场作用的光电子谱;(h)红外场作用下FROG模型得到的条纹光电子谱;(I) 红外激光场作用下超快动力学模型得到的条纹光电子谱
Fig. 2. Schematic of ultrafast dynamic model. (a) Energy-time distribution of initial photoelectron wave packet; (b) initial energy distribution of attosecond pulse and (c) photoelectron energy spectrum when IR laser delay is 0; (d) initial energy distribution of attosecond pulse and (e) photoelectron energy spectrum when IR laser delay is -0.667 fs; (f) vector potential of IR laser versus time; (g) photoelectron spectrum without IR laser; (h) streak photoelectron spectrum calculated by FROG model under
图 3. 不同阿秒脉冲啁啾对条纹光电子能谱的影响。(a)(d)正啁啾阿秒脉冲; (b)(e)负正啁啾阿秒脉冲; (c)(f)无啁啾阿秒脉冲
Fig. 3. Effects of different attosecond pulse chirps on stripe photoelectron energy spectrum. (a)(d)Attosecond pulses with positive chirps; (b)(e) attosecond pulses with negative chirps; (c)(f) chirp-free attosecond pulses
图 4. 待复原条纹能谱及各参量随阿秒脉冲宽度及啁啾的变化。(a)待复原条纹能谱; (b)不同延迟时刻下的能谱强度极大值轨迹; (c) Imin/Imax随阿秒脉冲时间宽度和啁啾大小的变化; (d) τmax随阿秒脉冲时间宽度和啁啾大小的变化; (e) fFWHMmax随阿秒脉冲宽度和啁啾大小的变化
Fig. 4. Streak spectrum to be reconstructed and all parameters versus attosecond pulse duration and chirp.(a) Streak spectrum to be reconstructed; (b) trace of local maximum intensity for different delay time; (c) Imin/Imaxversus attosecond pulse duration and chirp; (d) τmax versus attosecond pulse duration and chirp; (e) fFWHMmax versus attosecond pulse duration and chirp
图 5. 通过特定等值线确定阿秒脉冲时间宽度和啁啾大小的方法示意图
Fig. 5. Schematic of method for determining attosecond pulse duration and chirp value based on specific equal-value lines
表 1ELR算法与FROG-CRAB算法复原阿秒脉冲结果的比较
Table1. Comparison of attosecond pulse reconstruction results by ELR and FROG-CRAB methods
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邵任之, 李宾. 基于超快动力学模型的阿秒脉冲复原方法[J]. 光学学报, 2018, 38(9): 0932001. Renzhi Shao, Bin Li. Reconstruction Method of Attosecond Pulses Based on Ultrafast Dynamic Model[J]. Acta Optica Sinica, 2018, 38(9): 0932001.
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