Holographic Angular Streaking of Electrons and the Wigner-Time Delay

Abstract

For a circularly polarized single-color field at a central frequency of $2\omega$ the final electron momentum distribution upon strong field ionization does not carry any information about the phase of the initial momentum distribution. Adding a weak, co-rotating, circularly polarized field at a central frequency of $\omega$ gives rise to a sub-cycle interference pattern (holographic angular streaking of electrons (HASE)). This interference pattern allows for the retrieval of the derivative of the phase of the initial momentum distribution after tunneling ${\varphi }_{\mathrm{off}}^{\prime }(p_i)$. A trajectory-based semi-classical model (HASE model) is introduced which links the experimentally accessible quantities to ${\varphi }_{\mathrm{off}}^{\prime }(p_i)$. It is shown that a change in ${\varphi }_{\mathrm{off}}^{\prime }$ is equivalent to a displacement in position space $\Delta x$ of the initial wave packet after tunneling. This offset in position space allows for an intuitive interpretation of the Wigner time delay $\Delta {\tau }_W$ in strong field ionization for circularly polarized single-color fields. The influence of Coulomb interaction after tunneling is investigated quantitatively.

arXiv comment13 pages, 11 figures

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Cited by in corpus (7)

• Angular dependence of the Wigner time delay upon tunnel ionization of $H_2$
• Ultrafast Kapitza-Dirac effect
• Analysis of RABITT time delays using the stationary multi-photon molecular R-matrix approach
• Sideband Modulation by Sub-Cycle Interference
• Phase delays in $\omega -2\omega$ above-threshold ionization
• Quantum interference and imaging using intense laser fields
• Angular dependence of the Wigner time delay upon strong field ionization from an aligned p-orbital