AC Stark Effect on Vortex Spectra Generated by Circularly Polarized Pulses

Li, Meng; Zhang, Guizhong; Ding, Xin; Yao, Jianquan

doi:10.1109/jphot.2019.2916106

Cited by 7 publications

(5 citation statements)

References 38 publications

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“…Similar work on helium atom were also reported [21]. Inspired by the pioneering research on the vortex-shaped momentum distributions of atoms and molecules [20], [22]- [29], we undertake numerical simulations on neon atoms exposed to a pair of time-delayed and oppositely circularly polarized intense laser pulses for observing the induced vortex momentum distributions.…”

Section: Introductionmentioning

confidence: 75%

Optical-Stark Induced Distortions in Vortex Momentum Distributions of p-Orbital Electrons of Neon Atoms

Zhang

Tang

et al. 2020

IEEE Photonics J.

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We present results of numerical simulations on the photoelectron momentum distributions of the p-orbital electrons of neon atoms ionized by a pair of time-delayed and oppositely circularly polarized intense laser pulses. Deploying the strong-field theory, we can readily produce vortex-shaped momentum distributions. Similarity and disparity in the vortex patterns between the neon and hydrogen atoms are observed. The optical Stark effect is found to induce distortions in the vortex momentum distributions, which are quantitatively described by introducing several physical quantities. Among these quantities, the autocorrelation parameter turns out to be the most sensitive probe for extremely weak Stark effect. The nonlinear phase induced by the optical Stark effect deciphers the distortions of the vortex momentum distributions.

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Section: Introductionmentioning

confidence: 75%

Optical-Stark Induced Distortions in Vortex Momentum Distributions of p-Orbital Electrons of Neon Atoms

Zhang

Tang

et al. 2020

IEEE Photonics J.

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“…32) have been experimentally demonstrated by bichromatic MPI using time-delayed CRCP pulses [73] and analyzed by TDSE simulations [121]. FEVs have recently attracted much attention, both theoretically [155,[157][158][159][160][161][162][163][164][165][166][167][168][169][170][171][172][173][174] and experimentally [73,[102][103][104]. In this section we discuss our experimental results on the creation and manipulation of FEVs from femtosecond atomic MPI using shaper-generated single-color femtosecond CRCP pulse sequences (Figure 4D).…”

Section: Perturbative Resonance-enhanced Multiphoton Ionizationmentioning

confidence: 99%

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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“…So far, the physical properties and ionization dynamics of free electron vortices created by tunneling ionization are still unexplored. Although vortices from non-perturbative MPI have been investigated both experimentally [1,2] and theoretically [10][11][12] the transition of photoelectron vortices from the ATI to the tunneling regime has not been examined. In Fig.…”

Section: Perspectivesmentioning

confidence: 99%

“…The use of counterrotating circularly polarized (CRCP) time-delayed attosecond pulses was proposed as an alternative way to generate vortex-shaped photoelectron wave packets in the photoionization of helium atoms [9]. Subsequent theoretical studies have refined our understanding of electron vortices by investigating photoionization with intense [10][11][12] and bichromatic [11,[13][14][15] fields, double ionization [16][17][18] and molecular photoionization [14,15,18,19]. Control of electron vortices by the carrier envelope phase (CEP) [14,20], the relative optical phase [17,21] and the polarization state [13,15,16,22,23] was discussed.…”

Section: Introductionmentioning

confidence: 99%

Atomic photoionization dynamics in ultrashort cycloidal laser fields

Bayer,

Philipp,

Eickhoff

et al. 2020

Preprint

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We present numerical simulations of ultrafast multiphoton ionization dynamics in a twodimensional atomic model driven by co-and counterrotating circularly polarized single-color and bichromatic carrier envelope phase (CEP) stable ultrashort laser pulse sequences. Taking into account phase variations due to CEP fluctuations and the Gouy phase, our results accurately reproduce recently measured photoelectron momentum distributions [1][2][3][4]. The time evolution of the complexvalued electron wave function in coordinate and momentum space is calculated to study the bound state-and the vortex formation dynamics. The non-vanishing azimuthal probability current density proves the vortex nature of electron wave packets with odd-numbered rotational symmetry. Their angular momentum expectation value assumes half-integer values of 3.5 (corotating) and 0.5 (counterrotating). Knowledge of the wave function allows us to analyze the photoionization dynamics and to validate the physical pictures proposed in previous experimental studies. As an outlook, we investigate how electron vortices develop from the multiphoton-to the tunnel regime with increasing laser intensity.

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AC Stark Effect on Vortex Spectra Generated by Circularly Polarized Pulses

Cited by 7 publications

References 38 publications

Optical-Stark Induced Distortions in Vortex Momentum Distributions of p-Orbital Electrons of Neon Atoms

Optical-Stark Induced Distortions in Vortex Momentum Distributions of p-Orbital Electrons of Neon Atoms

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

Atomic photoionization dynamics in ultrashort cycloidal laser fields

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