High ellipticity of harmonics from molecules in strong laser fields of small ellipticity

Sun, Fengxian; Chen, C.; Li, W. Y.; Liu, X.; Li, W.; Chen, Y. J.

doi:10.1103/physreva.103.053108

Cited by 13 publications

(5 citation statements)

References 53 publications

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“…[1][2][3][4] Linear APs are restricted in probing chiral-sensitive light-matter interactions, [5,6] so it is desirable to generate APs with tunable polarization. Considerable efforts have been devoted to polarization control of harmonics in elliptically polarized (EP) fields, [7,8] (nearly) orthogonally two-color polarized (OTC) fields, [9][10][11] and co-rotating bicircular fields. [12] Recently, the bichromatic counter-rotating circularly polarized (BCCP) field with frequencies (ω, 2ω) has been proven to be an efficient laser scheme for generating the harmonics with large ellipticity.…”

Section: Introductionmentioning

confidence: 99%

Generating attosecond pulses with controllable polarization from cyclic H32+ molecules by bichromatic circular fields

Zhang 张,

Yan 闫

et al. 2024

Chinese Phys. B

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We investigate the polarization properties of harmonics from the cyclic ${\text{H}}_3^{2+}$ molecular ions in tailored bichromatic counter-rotating circularly polarized (BCCP) fields by solving the time-dependent Schrödinger equation. The allowed harmonics and their helicities are associated with the symmetry compatibility of the field-target systems, and large intensity difference between adjacent harmonics with opposite helicities appears in a wide spectral range when the BCCP field is at certain rotation angles. We try to explain the intensity difference by using a recombination model based on quantum-orbit theory and by analyzing the ionization pathways. Moreover, to synthesize attosecond pulse trains with tunable polarization, the intensity difference is manipulated by introducing a seed XUV field, and by changing the relative amplitude ratio as well as the helicity of BCCP fields.

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Section: Introductionmentioning

confidence: 99%

Generating attosecond pulses with controllable polarization from cyclic H32+ molecules by bichromatic circular fields

Zhang 张,

Yan 闫

et al. 2024

Chinese Phys. B

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“…Recently, circularly polarized (CP) or largely elliptically polarized (EP) attosecond pulses have gained considerable attention due to their applications in detecting circular dichroism in magnetic materials and chiral recognition [21][22][23][24][25]. Consequently, many efforts have been devoted to generating these pulses [25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

The Generation of Circularly Polarized Isolated Attosecond Pulses with Tunable Helicity from CO Molecules in Polarization Gating Laser Fields

Chen,

Yuan,

Wang

et al. 2024

Photonics

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We theoretically demonstrate a scheme to generate circularly polarized (CP) isolated attosecond pulses (IAPs) with tunable helicity using a polarization gating laser field interacting with the CO molecule. The results show that a broadband CP supercontinuum is produced from the oriented CO molecule, which supports the generation of an IAP with an ellipticity of 0.98 and a duration of 90 as. Furthermore, the helicity of the generated harmonics and IAP can be effectively controlled by modulating the laser field and the orientation angle of the CO molecule. Our method will advance research on chiral-specific dynamics and magnetic circular dichroism on the attosecond timescale.

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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%

“…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. They pointed out that high ellipticity always appears at harmonic orders around the interference minimum [22,23,25].…”

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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High ellipticity of harmonics from molecules in strong laser fields of small ellipticity

Cited by 13 publications

References 53 publications

Generating attosecond pulses with controllable polarization from cyclic H32+ molecules by bichromatic circular fields

Generating attosecond pulses with controllable polarization from cyclic H32+ molecules by bichromatic circular fields

The Generation of Circularly Polarized Isolated Attosecond Pulses with Tunable Helicity from CO Molecules in Polarization Gating Laser Fields

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

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