Elliptical high-order harmonic generation from 
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 driven by orthogonally polarized two-color laser fields

Huo, Xiao-Xin; Xing, Yun-He; Qi, Tong; Sun, Yue; Li, Bo; Zhang, Jun; Liu, Xue‐Shen

doi:10.1103/physreva.103.053116

Cited by 26 publications

(10 citation statements)

References 45 publications

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“…where R represents the intranuclear distance and its value is 2 a.u. and a is the soft-core parameter set to 0.735, corresponding to the ionization energy I p = −29.6 eV, [31] which is close to the real ionization energy of the H + 2 molecule. θ is the angle of the molecular axis with respect to the x-axis.…”

Section: Theoretical Methodsmentioning

confidence: 99%

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Generation of elliptical isolated attosecond pulse from oriented H2+ in a linearly polarized laser field

Xing¹,

Zhang²,

Huo³

et al. 2022

Chinese Phys. B

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We investigate the ellipticity of the high-order harmonic generation from the oriented $\textrm{H}_{2}^{+}$ exposed to a linearly polarized laser field by numerically solving the two dimensional time-dependent Schr$\ddot{\textrm{o}}$dinger equation (2D TDSE). Numerical simulations show that the harmonic ellipticity is remarkably sensitive to the alignment angle. The harmonic spectrum is highly elliptically polarized at a specific alignment angle $\theta = 30^\circ $, which is insensitive to the variation of the laser parameters. The position of the harmonic intensity minima indicates the high ellipticity, which can be attributed to the two-center interference effect. The high ellipticity can be explained by the phase difference of the harmonics. The results that we obtain facilitates the synthesis of a highly elliptical isolated attosecond pulses with duration down to 65 as, which can be served as a powerful tool to explore the ultrafast dynamics of molecules and study chiral light-matter interaction.

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Section: Theoretical Methodsmentioning

confidence: 99%

“…If the intensities in the two directions are very different, or the phase difference is near 0 or π, the ellipticity is small. [26,27,29,31]…”

Section: Theoretical Methodsmentioning

confidence: 99%

Generation of elliptical isolated attosecond pulse from oriented H2+ in a linearly polarized laser field

Xing¹,

Zhang²,

Huo³

et al. 2022

Chinese Phys. B

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“…with a x (ω) and a y (ω) are complex quantities. The ellipticity of the harmonics is calculated using the relation [41,42],…”

Section: Methodsmentioning

confidence: 99%

Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

Rajpoot¹,

Holkundkar²,

Bandyopadhyay³

2021

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

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We study the high harmonic generation (HHG) using elliptically polarized two-color driving fields. The HHG via bi-chromatic counter-rotating laser fields is a promising source of circularly polarized ultrashort XUV radiation at the attosecond time scale. The ellipticity or the polarization of the attosecond pulses can be tweaked by modifying the emitted harmonics' ellipticity, which can be controlled by varying the driver fields. A simple setup is used to control the polarization of the driving fields, which eventually changes the ellipticity of the attosecond pulses. A well-defined scaling for the ellipticity of the attosecond pulse as a function of the rotation angle of the quarter-wave plate is also deduced by solving the time-dependent Schr\"odinger equation (TDSE) in two dimensions. The scaling can further be explored to obtain the attosecond pulses of the desired degree of polarization, ranging from linear to elliptical to circular polarization.

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“…Strelkov et al proposed that the ellipticity of HHG originates from the quantum mechanical uncertainty of the electron motion [19]. It has also been shown that the origin of the ellipticity could be attributed to molecular orbital symmetry [20], the two-center interference effect [21,22], excited states of the system [23] and the Coulomb effect [24]. For instance, Zwan and Chen et al investigated the effects of two-center interference and multiple HHG routes in the ellipticity of harmonics from molecules in linearly polarized and slightly elliptical fields.…”

Section: Introductionmentioning

confidence: 99%

Interference effects in harmonic ellipticity from H 2+ molecules in an orthogonally polarized two-color laser field

Zhang

Jiang

et al. 2023

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

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We theoretically investigate the elliptically polarized harmonics from aligned molecular ion H2+ in orthogonally polarized two-color (OTC) laser pulses. Our results show that a striking peak appears in the ellipticity curve of odd-order harmonics, and this peak shows obvious alignment dependence and shifts toward higher energy as the amplitude ratio of two colors increases. The location of the peak is close to that of the interference minimum predicted by using a modified model of dipole, indicating strong two-center interference effects in ellipticity. Through adjusting the frequency ratio of two colors, large ellipticity is obtained for both odd and even harmonics in a wide energy region. As a result, we synthesize a bright elliptically polarized isolated attosecond pulse with an ellipticity up to 0.63.

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Elliptical high-order harmonic generation from H2+ driven by orthogonally polarized two-color laser fields

Cited by 26 publications

References 45 publications

Generation of elliptical isolated attosecond pulse from oriented H2+ in a linearly polarized laser field

Generation of elliptical isolated attosecond pulse from oriented H2+ in a linearly polarized laser field

Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

Interference effects in harmonic ellipticity from H 2+ molecules in an orthogonally polarized two-color laser field

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