电子全息角条纹测量的理想双色场比
Ideal Two-Color Field Ratio for Holographic Angular Streaking of Electrons
AI总结：
本文研究CoRTC激光场中氢分子强场电离的AHR亚周期干涉，通过实验与半经典模拟确定$E_{780}/E_{390}$在0.037–0.12时可见度最佳，为HASE测量Wigner时间延迟提供依据。
摘要：
我们研究分子氢在高强度同向旋转双色（CoRTC）激光场中的强场电离。测得的电子动量分布呈现交替半环（AHR），这是亚周期干涉的特征。我们报告了双色场比对该亚周期干涉可见度的作用。780 nm与390 nm峰值电场之比$E_{780}/E_{390}$在0.037至0.18之间变化。我们发现结果与半经典模拟非常吻合。我们得出结论：AHR图样可见需满足两个条件。第一，导致亚周期干涉的两条路径振幅必须相近，这出现在较低的双色场比$E_{780}/E_{390}$时。第二，两条路径的相位差必须足够大以允许相消干涉，这出现在较高的双色场比$E_{780}/E_{390}$时。在典型实验条件下，我们发现$E_{780}/E_{390}$在0.037至0.12范围内可使AHR图样具有良好可见度。这为未来利用电子全息角条纹（HASE）测量Wigner时间延迟的实验提供指导。
英文摘要：
We study strong field ionization of molecular hydrogen in highly intense co-rotating two-color (CoRTC) laser fields. The measured electron momentum distributions show alternating half-rings (AHR) that are characteristic for sub-cycle interference. We report on the role of the two-color field ratio for the visibility of this sub-cycle interference. The ratio of the peak electric field at 780 nm compared to the peak electric field at 390 nm $E_{780}/E_{390}$ is varied from 0.037 to 0.18. We find very good agreement with the results from our semiclassical simulation. We conclude that the AHR pattern is visible if two conditions are fulfilled. First, the amplitudes of the two pathways that lead to the sub-cycle interference have to be similar, which is the case for low two-color field ratios $E_{780}/E_{390}$. Second, the phase difference of the two pathways must be strong enough to allow for destructive interference, which is the case for high two-color field ratios $E_{780}/E_{390}$. For typical experimental conditions, we find that two-color field ratios $E_{780}/E_{390}$ in the range from 0.037 to 0.12 lead to good visibility of the AHR pattern. This guides future experiments to measure the Wigner time delay using holographic angular streaking of electrons (HASE).
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