Multiple rescattering processes in high-order harmonic generation from molecular system

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

doi:10.1364/oe.24.020297

Cited by 31 publications

(16 citation statements)

References 41 publications

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“…Seen from Fig. 6(b) , the internuclear distance changes far less than for t del = 8 fs, so similar cutoff energies can be obtained both from the recombinations with parent nucleus and neighboring nucleus 22 . Here we just provide the classical simulation about the former case, moreover, the multiple rescattering events have also been neglected considering the appearance of the spectral minimum in first rescattering in quantum simulation.…”

Section: Discussionsupporting

confidence: 56%

“…2(b) . As the spectral minimum origins from the ionization suppression, the classical simulation by solving the Newton’s equations of motion 22 , 23 can be used to judge the ionization moments for different t del . Seen from Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The corresponding time step is 0.2 a.u. The HHG spectrum can be obtained by Fourier transforming the time-dependent dipole acceleration 22 , 28 , and the time-frequency distribution by means of the wavelet transform 23 , 29 – 31 .…”

Section: Methodsmentioning

confidence: 99%

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

Zhang

Xia

Jia

et al. 2017

Sci Rep

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A pump-probe scheme for monitoring the electron dynamics of the excited state has been investigated by numerically solving the two-state time-dependent Schrödinger equation based on the non-Born-Oppenheimer approximation. By adjusting the delay time between a mid-infrared probe pulse and an ultra violet pump pulse, an obvious minimum can be seen in the higher-order harmonic region. With electron probability density distribution, ionization rate and classical simulation, the minimum can be ascribed to the electron localization around one nucleus at larger delay time and represents the electron dynamics of the excited state at the time of ionization. Moreover, the position of the minimum is much more sensitive to the nuclear motion.

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Section: Discussionsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 99%

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

Zhang

Xia

Jia

et al. 2017

Sci Rep

Self Cite

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“…From the second half optical cycle on, there are more complicated structures under the curved structure. Such structures are similar to the well-known structures in the time-frequency structure of HHG signals [38]. To make a close comparison, we calculated the HHG response by calculating the dipole acceleration from the simulated electron wave function [12].…”

Section: B Time-frequency Analysis Of Time-domain Signalssupporting

confidence: 62%

Attosecond x-ray probing of laser-induced electron rescattering in atoms

Zhang¹,

Xie

2020

Phys. Rev. Research

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We propose an attosecond time-domain spectroscopy to study laser-induced electron rescattering in atoms by using single photoionization with an attosecond x-ray pulse. From the time-frequency analysis of the time-domain signal, we obtained simultaneously the subcycle time and energy information of the rescattering electron wave packet during the interaction of a helium-like atom with a strong laser field. The obtained time and energy distributions nicely agree with the electron rescattering picture from the analysis based on the high-order harmonic response by the dipole acceleration and classical trajectory calculations. Contributions and interference from multiple rescattering can be unambiguously identified in the time and energy distributions of rescattering electrons. Since the observable of x-ray single photoionization yield is proportional to the electron density near the nucleus, the proposed time-domain spectroscopy can in general be applied to studies of other light-induced linear and nonlinear polarization effects in atoms and molecules.

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“…Ultra-short intense extreme ultraviolet (XUV) pulses are very useful for detecting micro-dynamics of atoms, molecular and condensed matter [1,2]. High-order harmonics generated from non-relativistic intense laser interaction with noble gases are typical XUV sources, which have been widely used [3,4]. However, the intensities of these harmonics are restricted by the low driver intensity.…”

Section: Introductionmentioning

confidence: 99%

Directional enhancement of selected high-order-harmonics from intense laser irradiated blazed grating targets

et al. 2017

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Relativistically intense laser solid target interaction has been proved to be a promising way to generate high-order harmonics, which can be used to diagnose ultrafast phenomena. However, their emission direction and spectra still lack tunability. Based upon two-dimensional particle-in-cell simulations, we show that directional enhancement of selected high-order-harmonics can be realized using blazed grating targets. Such targets can select harmonics with frequencies being integer times of the grating frequency. Meanwhile, the radiation intensity and emission area of the harmonics are increased. The emission direction is controlled by tailoring the local blazed structure. Theoretical and electron dynamics analysis for harmonics generation, selection and directional enhancement from the interaction between multi-cycle laser and grating target are carried out. These studies will benefit the generation and application of laser plasma-based high order harmonics.

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Multiple rescattering processes in high-order harmonic generation from molecular system

Cited by 31 publications

References 41 publications

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

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

Attosecond x-ray probing of laser-induced electron rescattering in atoms

Directional enhancement of selected high-order-harmonics from intense laser irradiated blazed grating targets

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