论文标题
通过光学条纹衡量的适当时间延迟
Proper time delays measured by optical streaking
论文作者
论文摘要
条纹光谱图的产生基于条纹激光的能量吸收。在研究这种吸收时，我们严格地显示了测得的时间移位与条纹光的性质无关。在这种情况下，它提供了Wigner-Smith时间延迟。对于具有远距离尾巴的系统，例如库仑系统，后者是无限的。在这里，我们建议确定相对于纯氢的时间延迟以获得有意义的结果。到目前为止，在没有氢参考的情况下为库仑系统获得的有限延迟是有限条纹频率的结果，并取决于其值以及电子的多余能量。我们的分析还提出了一种时间延迟的测量技术，可以避免完整的条纹扫描记录。
The generation of a streaking spectrogram is based on energy absorption from the streaking laser. Investigating this absorption we show rigorously under which condition the measured time shift is independent of properties of the streaking light. In this case it provides the Wigner-Smith time delay. The latter is infinite for systems with a long-range potential tail, such as Coulomb systems. Here, we suggest to determine the time delay relative to pure hydrogen for meaningful results. Finite delays obtained so far for Coulombic systems without the hydrogen reference are the consequence of a finite streaking frequency and depend on its value as well as on the electron's excess energy. Our analysis also suggests a time-delay measurement technique that avoids the record of a complete streaking scan.
