Photoelectron Holographic Interferometry to Probe the Longitudinal Momentum Offset at the Tunnel Exit

Min Li, Hui Xie, Wei Cao, Siqiang Luo, Jia Tan, Yudi Feng, Baojie Du, Weiyu Zhang, Yang Li, Qingbin Zhang, Pengfei Lan, Yueming Zhou, and Peixiang Lu
Phys. Rev. Lett. 122, 183202 – Published 7 May 2019
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Abstract

Laser-induced electron tunneling underlies numerous emerging spectroscopic techniques to probe attosecond electron dynamics in atoms and molecules. The improvement of those techniques requires an accurate knowledge of the exit momentum for the tunneling wave packet. Here we demonstrate a photoelectron interferometric scheme to probe the electron momentum longitudinal to the tunnel direction at the tunnel exit by measuring the photoelectron holographic pattern in an orthogonally polarized two-color laser pulse. In this scheme, we use a perturbative 400-nm laser field to modulate the photoelectron holographic fringes generated by a strong 800-nm pulse. The fringe shift offers direct experimental access to the intermediate canonical momentum of the rescattering electron, allowing us to reconstruct the momentum offset at the tunnel exit with high accuracy. Our result unambiguously proves the existence of nonzero initial longitudinal momentum at the tunnel exit and provides fundamental insights into the nonquasistatic nature of the strong-field tunneling.

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  • Received 20 December 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.183202

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Min Li1,*, Hui Xie1, Wei Cao1, Siqiang Luo1, Jia Tan1, Yudi Feng1, Baojie Du1, Weiyu Zhang1, Yang Li1, Qingbin Zhang1, Pengfei Lan1, Yueming Zhou1,†, and Peixiang Lu1,2,‡

  • 1Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China

  • *mli@hust.edu.cn
  • zhouymhust@hust.edu.cn
  • lupeixiang@hust.edu.cn

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Issue

Vol. 122, Iss. 18 — 10 May 2019

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