持续量子干涉电子轨迹
Persistent quantum interfering electron trajectories
摘要：
电离阈值以上谐波的发射是由两个电子波包在原子连续谱中沿“短”和“长”轨迹运动的复合引起的。阿秒脉冲训练产生迄今已被归因于短轨迹，试图通过有针对性的磁阻选择性相位匹配条件被隔离。在这里，我们提供了实验证据的贡献，这两个轨迹的谐波发射，即使在相位匹配条件下不利的长轨迹。这是在作为驱动激光强度的函数的谐波产额的干涉调制中的指纹。该效应在由谐波和驱动激光场的频率混合产生的边带产量中也是可观察的，该效应在互相关脉冲计量方法中具有后果。
英文摘要：
The emission of above-ionization-threshold harmonics results from the recombination of two electron wavepackets moving along a "short" and a "long" trajectory in the atomic continuum. Attosecond pulse train generation has so far been attributed to the short trajectory, attempted to be isolated through targeted trajectory-selective phase matching conditions. Here, we provide experimental evidence for the contribution of both trajectories to the harmonic emission, even under phase matching conditions unfavorable for the long trajectory. This is finger printed in the interference modulation of the harmonic yield as a function of the driving laser intensity. The effect is also observable in the sidebands yield resulting from the frequency mixing of the harmonics and the driving laser field, an effect with consequences in cross-correlation pulse metrology approaches.
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