Monitoring the electron dynamics of the excited state via higher-order spectral minimum

Zhang, Caiping; Xia, Chang-Long; Jia, Xiaofang; Miao, Xiang-Yang

doi:10.1038/s41598-017-10667-6

Cited by 7 publications

(6 citation statements)

References 30 publications

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“…The TDSE for a hydrogen atom interacting with orthogonally polarized laser fields is expressed in two-dimensional (2D) cartesian coordinates. The 2D-model has been used in many theoretical studies (see for instance 13,47 ) and has been shown to reproduce well the full three-dimensional calculations (see the Supplemental Material for details about the calculations 44 ), allowing thus a correct description of the dynamics involved in the hydrogen atom with less computational efforts. On the basis of this model, the TDSE is written as…”

Section: Methodsmentioning

confidence: 99%

Quantum control and characterization of ultrafast ionization with orthogonal two-color laser pulses

Agueny

2020

Sci Rep

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We study ultrafast ionization dynamics using orthogonally polarized two-color (OTC) laser pulses involving the resonant "first plus second" (ω + 2ω) scheme. The scheme is illustrated by numerical simulations of the time-dependent Schrödinger equation and recording the photoelectron momentum distribution. On the basis of the simulations of this resonant ionization, we identify signatures of the dynamic Autler-Townes effect and dynamic interference, in which their characterization is not possible in spectral domain. Taking advantage of the OTC scheme we show that these dynamical effects, which occur at the same time scale, can be characterized in momentum space by controlling the spatial quantum interference. In particular, we show that with the use of this control scheme, one can tailor the properties of the control pulse to lead to enhancement of the ionization rate through the Autler-Townes effect without affecting the dynamic interference. This enhancement is shown to result from constructive interferences between partial photoelectron waves having opposite-parity, and found to manifest by symmetry-breaking of the momentum distribution. The scenario is investigated for a prototype of a hydrogen atom and is broadly applicable to other systems. Our findings may have applications for photoelectron interferometers to control the electron dynamics in time and space, and for accurate temporal characterization of attosecond pulses.

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Section: Methodsmentioning

confidence: 99%

Quantum control and characterization of ultrafast ionization with orthogonal two-color laser pulses

Agueny

2020

Sci Rep

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“…In fact, the harmonic generation also records the excited-state dynamics. [15,16] For the symmetric molecular ions, it can be encoded in both the lower-order [15] and the higher-order harmonics. [16] The former is attributed to the two-center interference, while the latter is ascribed to the electron localization.…”

Section: Introductionmentioning

confidence: 99%

“…[15,16] For the symmetric molecular ions, it can be encoded in both the lower-order [15] and the higher-order harmonics. [16] The former is attributed to the two-center interference, while the latter is ascribed to the electron localization. With dynamical symmetry breaking, the even harmonics from the symmetric molecular ions can manifest the excited-state dynamics in both linearly and elliptically polarized laser fields.…”

Section: Introductionmentioning

confidence: 99%

Decoding the electron dynamics in high-order harmonic generation from asymmetric molecular ions in elliptically polarized laser fields

Zhang¹,

Miao²

2022

Chinese Phys. B

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The high-order harmonic generation from an asymmetric molecular ion is theoretically investigated based on the Born–Oppenheimer model with two-dimensional electron dynamics. It is shown that the harmonic intensity changes periodically in elliptically polarized laser fields. The periodical character is ellipticity-dependent. By establishing the physical image, the periodicity of the harmonic intensity can be ascribed to the contributions of the ground state and the excited state. Furthermore, the electron dynamics from different electronic states can be selected via combining the elliptically polarized laser field with a static electric field. The harmonics dominated either by ground state or excited state are emitted once in an optical cycle in the combined laser field.

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“…High-order harmonic generation (HHG) which is a useful tool to monitor quantum dynamics has been intensively investigated. [1][2][3][4][5][6][7] HHG could be used to produce attosecond pulse [8][9][10][11][12] that is a powerful tool to probe, track, control the dynamics of electron in ultrafast process. [13][14][15][16] Recently, linearly polarized attosecond pulse could be obtained from linear polarized harmonics in experiments, [17,18] and the HHG process is well described by semiclassical three-step model.…”

Section: Introductionmentioning

confidence: 99%

Selection of right-circular-polarized harmonics from p orbital of neon atom by two-color bicircular laser fields*

Xia

Lan

et al. 2019

Chinese Phys. B

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The polarization properties of high-order harmonic generation (HHG) in the two-color circularly polarized laser fields are investigated by numerically solving the two-dimensional time-dependent Schrödinger equation. By adding a wavelength of 1600-nm right-circular-polarized field to an 800-nm left-circular-polarized field, HHG is simulated from a real model of neon atom with p orbital, but not from a hydrogen-like atom model with s orbital. The orders of 3n+1 can be selected while the orders of 3n+2 are suppressed by adjusting the intensities of the two pulses. The physical mechanism is analyzed by time–frequency analysis and semiclassical model.

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Monitoring the electron dynamics of the excited state via higher-order spectral minimum

Cited by 7 publications

References 30 publications

Quantum control and characterization of ultrafast ionization with orthogonal two-color laser pulses

Quantum control and characterization of ultrafast ionization with orthogonal two-color laser pulses

Decoding the electron dynamics in high-order harmonic generation from asymmetric molecular ions in elliptically polarized laser fields

Selection of right-circular-polarized harmonics from p orbital of neon atom by two-color bicircular laser fields*

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