Atomic photoionization dynamics in ultrashort cycloidal laser fields

Bayer, Tim; Philipp, Ch.; Eickhoff, K.; Wollenhaupt, M.

doi:10.1103/physreva.102.013104

Cited by 16 publications

(28 citation statements)

References 70 publications

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“…The expression given by eqn (30) maps the SFA condition onto vortex Fermat spirals. It demonstrates, via this semiclassical relation, in specic regions where l(p) is an integer, that eqn (30) will behave like the condition given by eqn(28).…”

mentioning

confidence: 73%

“…Experimental progress in this domain continues to gather pace, and vortex measurements at mid-infrared wavelengths are being carried out. 28 Interference vortices are indicative of photoelectrons carrying OAM, as the interference of two states with differing OAM produces such spirals. The above-mentioned multiphoton studies have provided explanations in terms of the magnetic quantum number in the bound states and scattering states to which the photoelectron is promoted, but do not go as far as discussing the OAM of the free electron or its measurement and control.…”

Section: Introductionmentioning

confidence: 99%

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Manipulating twisted electrons in strong-field ionization

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confidence: 73%

Section: Introductionmentioning

confidence: 99%

Manipulating twisted electrons in strong-field ionization

et al. 2021

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“…In [48,103], we provided a description for the calculation of sculpted 3D free electron wave packets from MPI, including the energy and angular distribution. Recently, we employed ab initio methods to numerically solve the time-dependent Schrödinger equation (TDSE) for a 2D model atom interacting with a polarizationtailored bichromatic femtosecond laser pulse sequence [121]. The model was applied to reproduce and analyze our experimental results reported in [73,103] taking into account phase fluctuations in the CEP and the Gouy phase.…”

Section: Simulation Of Multiphoton Ionizationmentioning

confidence: 99%

“…(C) Scheme for perturbative control of intraband [73] and interband [105] MPI with polarization-shaped pulses along with multiphoton spectra. (D) Model potential for ab initio simulations of MPI with cycloidal laser pulses [121].…”

Section: Molecular Multiphoton Ionizationmentioning

confidence: 99%

“…Another efficient method to simulate atomic photoionization dynamics by polarization-shaped ultrashort laser fields is based on solving of the TDSE numerically for a 2D model system aligned in the laser polarization plane. In [121], we employed the 2D model potential shown in Figure 1D V…”

Section: D Ab Initio Simulation Of Atomic Multiphoton Ionization In Cycloidal Laser Fieldsmentioning

confidence: 99%

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Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

et al. 2021

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In this review, we report on recent progress in the generation and application of multichromatic polarization-tailored pulse sequences for the coherent control of multiphoton ionization (MPI) dynamics and present unpublished experimental results that complement our previous findings. Specifically, we utilize single-color, bichromatic, and trichromatic polarization-controlled pulse sequences generated by spectral amplitude, phase and polarization modulation of a carrier-envelope phase (CEP)-stable white light supercontinuum for MPI. The analysis of the number of ionization pathways and the number of distinct final free electron states shows that both increase significantly, but scale differently with the number of absorbed photons and the number of pulses in the sequence. In our experiments, ultrafast polarization shaping is combined with high-resolution photoelectron tomography to generate, control, and reconstruct three-dimensional photoelectron momentum distributions from atomic and molecular MPI. We discuss the use of polarization-controlled single-color and bichromatic pulse sequences in perturbative and non-perturbative coherent control of coupled electron-nuclear dynamics in molecules, atomic spin-orbit wave packet dynamics and the directional photoemission from atoms and chiral molecules. We compare the coherent control of CEP-insensitive intraband multipath interference in the MPI with a fixed number of photons with CEP-sensitive interband multipath interference in the ionization with a different number of photons. The generation and control of free electron vortices with even-numbered rotational symmetry by MPI with single-color pulse sequences is contrasted with the bichromatic control of CEP-sensitive electron vortices with odd-numbered rotational symmetry. To illustrate the potential of multichromatic pulse sequences for coherent control, we present a trichromatic scheme for shaper-based quantum state holography.

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Coherent control mechanisms in bichromatic multiphoton ionization

Eickhoff¹,

Feld²,

Köhnke³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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Free electron vortices (FEVs) generated by multiphoton ionization (MPI) with ultrashort laser pulses have attracted significant attention due to their varied symmetries and unusual topological properties. We study two physical mechanisms of coherent control in atomic MPI with bichromatic polarization-shaped femtosecond laser pulses which give rise to the rich variety of FEVs. In the experiments, we combine pulse shaping of a carrier-envelope phase-stable supercontinuum with photoelectron tomography to generate and reconstruct three-dimensional photoelectron momentum distributions (PMDs). Simultaneous measurements of energetically separated photoelectrons from intraband and interband interference in a single PMD allow us to compare phase and polarization control of the angular distributions by both mechanisms. We investigate phase control in three scenarios: first, counterrotating circularly polarized pulses are employed to contrast the phase-insensitive angular momentum eigenstate created by intraband interference via frequency mixing with the phase-sensitive c 7 rotationally symmetric FEV from pure interband interference of two single-color ionization pathways. In the second scenario, we use orthogonal linearly polarized pulses to compare the phase control properties of a six-lobed angular momentum wave packet from intraband interference to those of a complex shaped interband PMD in the presence of phase fluctuations. Finally, we demonstrate phase control of a photoelectron hologram from mixed interband interference. In a (3 + 1) resonance enhanced MPI scheme, the red pump pulse induces a bound electron wave packet probed by the time-delayed blue pulse. The latter simultaneously creates a reference wave packet by three-photon ionization to form the photoelectron hologram. Rotation of the hologram with c 1 or c 5 rotational symmetry maps the time evolution of the bound wave packet. To analyze our results, we develop analytical expressions for the wave functions of intraband and interband interference in perturbative non-resonant MPI. The experiments are complemented with two-dimensional TDSE simulations to follow the FEV formation dynamics and to validate the physical pictures.

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Atomic photoionization dynamics in ultrashort cycloidal laser fields

Cited by 16 publications

References 70 publications

Manipulating twisted electrons in strong-field ionization

Manipulating twisted electrons in strong-field ionization

Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

Coherent control mechanisms in bichromatic multiphoton ionization

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