Measuring the electric field of few-cycle laser pulses by attosecond cross correlation.
Measuring the electric field of few-cycle laser pulses by attosecond cross correlation.
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DOI：
10.1103/physrevlett.89.283903
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发表时间：
2002-12
影响因子：
8.6
通讯作者：
A. Bandrauk;S. Chelkowski;N. Shon
中科院分区：
文献类型：
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作者：
A. Bandrauk;S. Chelkowski;N. Shon
提出了一种直接测量线偏振短周期激光脉冲电场的新方法。基于H原子在红外(IR)飞秒(FS)和紫外(UV)阿秒(As)激光脉冲组合场中的含时薛定谔方程(TDSE)的解，我们发现，作为两个脉冲之间时间延迟的函数，相反方向(沿激光脉冲的极化矢量)的光电子信号的差异(或等价地，不对称)很好地再现了IR脉冲中电场(或矢势)的轮廓。这种电离不对称可用于直接测量红外飞秒激光脉冲的载波包络相位差(即载波频率相对于脉冲包络的相对相位)。
A new technique for directly measuring the electric field of linearly polarized few-cycle laser pulses is proposed. Based on the solution of the time-dependent Schrödinger equation (TDSE) for an H atom in the combined field of infrared (IR) femtosecond (fs) and ultraviolet (UV) attosecond (as) laser pulses we show that, as a function of the time delay between two pulses, the difference (or equivalently, asymmetry) of photoelectron signals in opposite directions (along the polarization vector of laser pulses) reproduces very well the profile of the electric field (or vector potential) in the IR pulse. Such ionization asymmetry can be used for directly measuring the carrier-envelope phase difference (i.e., the relative phase of the carrier frequency with respect to the pulse envelope) of the IR fs laser pulse.