We present a method to estimate the backward rescattering time of a tunnel-ionized electron in an intense laser pulse. The idea of the classical backpropagation method is applied to determine the backward rescattering time and its dependence on various parameters such as the ionization potential of the parent ion, its spatial profile and the peak intensity and wavelength of the driving laser field. The accurate estimation of the rescattering time would provide critical information in analyzing ultrafast rescattering dynamics in applications such as high-order harmonic generation, above-threshold ionization, and laser-induced electron diffraction experiments. We find that the backward rescattering time is significantly affected by the peak intensity of the laser pulse. The rescattering time changes by a few hundred attoseconds when the peak intensity varies from $1\times {10}^{14}$ to $5\times {10}^{14}\mathrm{W}/\mathrm{c}{\mathrm{m}}^2$.

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用于探测强激光场中隧道电离电子后向再散射时间的经典反向传播

我们提出了一种估计强激光脉冲中隧道电离电子的后向再散射时间的方法。应用经典反向传播方法的思想来确定反向再散射时间及其对各种参数的依赖性，例如母离子的电离势、其空间分布以及驱动激光场的峰值强度和波长。准确估计再散射时间将为分析应用中的超快再散射动力学提供关键信息，例如高次谐波产生、阈值以上电离和激光诱导电子衍射实验。我们发现后向再散射时间受激光脉冲峰值强度的显着影响。$1\times {10}^{14}$ 到 $5\times {10}^{14}\mathrm{宽}/\mathrm{C}{\mathrm{米}}^2$.