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首页> 外文期刊>Physical review >Modeling of ultrafast interferometric three-photon photoemission from a metal surface irradiated with sub-10-fs laser pulses
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Modeling of ultrafast interferometric three-photon photoemission from a metal surface irradiated with sub-10-fs laser pulses

机译：低于10 fs激光脉冲照射的金属表面的超快干涉三光子光发射模型

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摘要

We present an effective four-level density matrix model for describing ultrafast interferometric three-photon photoemission (3PPE) from a metal surface. The model accounts for the slow resonant and the fast nonresonant excitation channels through the energy continua, in the presence of energy and phase relaxation of the electronic states. Calculations are presented for the case of a gold surface irradiated with 9.5 fs Tksapphire laser pulses, where we find good agreement with recent experimental results for the photocharge vs the time delay between two identical laser subpulses. Numerical results are also presented for the photocurrent densities of the different excitation channels and the photocharge densities vs time delay for various laser pulse widths from 100 down to 2.5 fs (one optical period). It is shown that interferometric 3PPE can be used to measure sub-10-fs laser pulse widths and for extracting lifetimes of conduction electrons.
机译：我们提出了一种有效的四级密度矩阵模型，用于描述金属表面的超快干涉三光子光发射（3PPE）。该模型解释了在存在能量和电子态的相位弛豫的情况下，通过能量连续性产生的慢共振和快非共振激发通道。给出了用9.5 fs Tksapphire激光脉冲照射金表面的情况的计算结果，我们发现光电荷与两个相同激光亚脉冲之间的时间延迟之间的一致性与最近的实验结果非常吻合。还给出了不同激发通道的光电流密度以及从100到2.5 fs（一个光学周期）的各种激光脉冲宽度下光电荷密度与时间延迟的数值结果。结果表明，干涉式3PPE可以用于测量低于10 fs的激光脉冲宽度并提取导电电子的寿命。

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