Effects of inhomogeneous laser field in time and space on the generation of broad spectral continuum and ultrashort attosecond pulse

Liu, H.; Feng, Liqiang; Sani, R. M.

doi:10.1142/s0217984920501316

Cited by 4 publications

(1 citation statement)

References 54 publications

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“…More recently, generation of a single attosecond pulse with the help of the asymmetric polarization-gating technique was analyzed [60], as well as with three-color electric fields [61]. Also, in [62] the influence of the time and space inhomogeneities of the laser field on the HHG spectra and the attosecond pulses was investigated, while in [63] a method to produce circularly polarized attosecond pulses with tunable helicity from a CO molecule was proposed. Finally, it was shown that the ellipticity of attosecond pulses can be controlled in plasmonic-enhanced counter-rotating bicircular fields [64].…”

Section: Introductionmentioning

confidence: 99%

High-order harmonic generation by planar polyatomic molecules exposed to an orthogonally polarized two-color laser field

Habibović¹,

Becker²,

Milošević³

2021

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

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The molecular strong-field approximation is employed to study high-order harmonic generation by linear and planar polyatomic molecules exposed to an orthogonally polarized two-color laser field, which consists of two orthogonal linearly polarized components with commensurable frequencies. For such a driving field, we find that the harmonic emission rate and the shape of the spectrum strongly depend on the laser-field parameters including the relative phase and the ratio of the intensities of the two components. The values of the relative phase that correspond to the optimal harmonic emission rate, as well as the cutoff position, can be assessed using a classical model. The possible production of an isolated attosecond pulse is investigated. For suitable symmetry of the laser field an attosecond pulse train with only one attosecond pulse per cycle can be generated. Depending on the frequencies of the two field components, the molecular symmetry properties and the orientation of the molecule with respect to the field, the even harmonics can be absent from the spectrum, which can be used to determine the molecular orientation. The emitted harmonics are elliptically polarized and their ellipticity depends on the molecular orientation.

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Section: Introductionmentioning

confidence: 99%

High-order harmonic generation by planar polyatomic molecules exposed to an orthogonally polarized two-color laser field

Habibović¹,

Becker²,

Milošević³

2021

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

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Nonlinear chirp combination effect on the improvement of high harmonic spectra and attosecond pulses

Feng

Jing

Qiao

et al. 2021

Int. J. Mod. Phys. B

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The effect of nonlinear chirp combination on the enhancement of harmonic cutoff and harmonic intensity has been investigated by using a two-color chirped pulse. It is found that with the combination of 2-order chirp form, the strongest intensity enhancement of harmonic spectrum can be found. While, with the combination of 2-order and 3-order chirp forms, the largest cutoff extension of the harmonic spectrum can be obtained. Finally, by properly using the harmonic spectra driven by the above two kinds of combined pulses, the single attosecond pulses (SAPs) of 43 as and 33 as can be generated.

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Controlling electron acceleration process to produce harmonic spectral continuum and single harmonic

Hang

Feng

Qiao

et al. 2022

Int. J. Mod. Phys. B

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In this paper, a potential scheme to produce both the harmonic spectral continuum and single harmonic has been proposed and investigated by using the combined chirped pulses. It is found that with the proper combination of the two-color second-order chirped pulse, both the harmonic spectral continuum and single harmonic can be obtained. Further, with the introduction of the third pulse, the harmonic yield can be enhanced. However, the single harmonic generation is almost independent on the chirp of the third pulse. As a result, the isolated attosecond pulses (IAPs) of sub-40 as can be obtained from the harmonic spectral continua and the adjustable single harmonics from 194th order to 360th order can also be found. While with the introduction of the third-order or fourth-order chirped pulses, only the harmonic spectral continua can be obtained. The generations of the harmonic spectral continua and single harmonics have been analyzed by using the three-step theory and the time-profiles of the harmonic generation.

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Effects of inhomogeneous laser field in time and space on the generation of broad spectral continuum and ultrashort attosecond pulse

Cited by 4 publications

References 54 publications

High-order harmonic generation by planar polyatomic molecules exposed to an orthogonally polarized two-color laser field

High-order harmonic generation by planar polyatomic molecules exposed to an orthogonally polarized two-color laser field

Nonlinear chirp combination effect on the improvement of high harmonic spectra and attosecond pulses

Controlling electron acceleration process to produce harmonic spectral continuum and single harmonic

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