Disentangling Intracycle Interferences in Photoelectron Momentum Distributions Using Orthogonal Two-Color Laser Fields.

@article{Xie2017DisentanglingII,
  title={Disentangling Intracycle Interferences in Photoelectron Momentum Distributions Using Orthogonal Two-Color Laser Fields.},
  author={Xinhua Xie and Tian Wang and Shaogang Yu and XuanYang Lai and Stefan Roither and Daniil V. Kartashov and Andrius Baltuska and Xiaojun Liu and Andr{\'e} Staudte and Markus Kitzler},
  journal={Physical review letters},
  year={2017},
  volume={119 24},
  pages={
          243201
        }
}
We use orthogonally polarized two-color (OTC) laser pulses to separate quantum paths in the multiphoton ionization of Ar atoms. Our OTC pulses consist of 400 and 800 nm light at a relative intensity ratio of 10∶1. We find a hitherto unobserved interference in the photoelectron momentum distribution, which exhibits a strong dependence on the relative phase of the OTC pulse. Analysis of model calculations reveals that the interference is caused by quantum pathways from nonadjacent quarter cycles. 

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