Crystal-Momentum-Resolved Contributions to Harmonics in Laser-Driven Graphene

Peng, Zhao-Yang; Lang, Yue; Zhu, Yalei; Zhao, Jianlin; Zhang, Dongwen; Zhao, Zengxiu; Yuan, Jian‐Min

doi:10.1088/0256-307x/40/5/054203

Cited by 4 publications

(4 citation statements)

References 44 publications

(57 reference statements)

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“…[1,2] It has emerged as a promising technique for generating coherent extreme ultraviolet (XUV) light on a tabletop scale, [3] as well as for producing attosecond pulse trains or isolated attosecond pulses. [4,5] The advancements in HHG have provided new opportunities for investigating electronic dynamics in different systems, including gases, [6,7] solids, [8][9][10][11] liquids, [12] and plasmas. [13] The HHG can be well described by the semi-classical three-step model (TSM).…”

Section: Introductionmentioning

confidence: 99%

Elliptically polarized high-order harmonic generation of Ar atom in an intense laser field

Hu 胡,

Wang 王,

Jing 景

et al. 2024

Chinese Phys. B

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We have conducted experimental investigations on the high-order harmonic generation (HHG) of Ar atom in an elliptically polarized intense laser field. Interestingly, we observe an anomalous dependence on the laser ellipticity (ε) in the lower-order harmonics, specifically in the 13rd-order, which displayed maximal harmonic intensity at ε ≈ 0.1, rather than at ε = 0 as expected. This contradicts the general trend of harmonic yield, which typically decreases with the increase of laser ellipticity. In this study, we attribute this phenomenon to the disruption of the symmetry of the wave function by the Coulomb effect, leading to the generation of a harmonic with high ellipticity. This finding provides valuable insights into the behavior of elliptically polarized harmonics and offers a potential avenue for exploring new applications in ultrafast spectroscopy and light-matter interactions.

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Section: Introductionmentioning

confidence: 99%

Elliptically polarized high-order harmonic generation of Ar atom in an intense laser field

Hu 胡,

Wang 王,

Jing 景

et al. 2024

Chinese Phys. B

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“…[17][18][19] Due to the emitted high harmonics containing information about the interaction and electronic dynamics, HHG has been introduced into different systems, including gases, [20] plasmas, [21] and solids. [22][23][24][25][26] The HHG process has also been studied extensively in theory and experiment for generating XUV vortices, which has emerged as an important research area. [27][28][29][30][31][32][33] Researchers have made significant progress in understanding and manipulating XUV vortex beams generated through the HHG process.…”

Section: Introductionmentioning

confidence: 99%

Optimization of extreme ultraviolet vortex beam based on high harmonic generation

Xiao 肖,

Zhao 赵,

Cheng 程

et al. 2024

Chinese Phys. B

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In high harmonic generation (HHG), Laguerre-Gaussian (LG) beams are used to generate extreme ultraviolet (XUV) vortices with well-defined orbital angular momentum (OAM), which have potential applications in fields such as microscopy and spectroscopy. We conducted an experimental study on the HHG driven by vortex and Gaussian beams. We found that the intensity of vortex harmonics was positively correlated with the laser energy and gas pressure. The structure and intensity distribution of the vortex harmonics exhibit significant dependence on the relative position between the gas jet and the laser focus. The ring-like structures observed in the vortex harmonics, and the interference of quantum paths provide an explanation for the distinct structural characteristics. Moreover, by adjusting the relative position between the jet and laser focus, it is possible to discern the contributions from different quantum paths. The optimization of the HH vortex field is applicable to the XUV, which opens new avenues for exploiting the potential in optical spin or manipulating electrons using the photon with tunable orbital angular momentum.

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“…In the past decade, a large number of theoret-ical and experimental studies related to HHG have been carried out for series of solid materials with different band gaps and properties. [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] Among them, two-dimensional crystal materials have become popular target for solid high-order harmonics due to their unique electronic structure, excellent optical properties, strong electron-electron interaction, and negligible propagation effects. [49,50] In addition, polarization characteristics of high-order harmonics of two-dimensional materials have a strong tunability, and it is possible to utilize two-dimensional materials to generate circularly polarized high-order harmonics.…”

mentioning

confidence: 99%

Modulation of High-Order Harmonic Generation from a Monolayer ZnO by Co-rotating Two-Color Circularly Polarized Laser Fields

Qiao 乔,

Chen 陈,

Zhou 周

et al. 2024

Chinese Phys. Lett.

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By numerically solving the two-dimensional semiconductor Bloch equation, this paper studies the high-order harmonic emission of a monolayer ZnO under the driving of co-rotating two-color circularly polarized laser pulses. By changing the relative phase between the fundamental frequency field and the second one, it is found that the harmonic intensity in the platform region can be significantly modulated. In the higher order, the harmonic intensity can be increased by about one order of magnitude. Through time-frequency analysis, it is demonstrated that the the emission trajectory of monolayer ZnO can be cotrolled by the relative phase, and the harmonic enhacment is caused by the second quantum trajectory with the higher emission probability. In addition, near-circularly polarized harmonics can be generated in the co-rotating two-color circularly polarized fields. With the change of the relative phase, the harmonics in the platform region can be altered from left-handed near-circularly polarization to right-handed one. Our results can obtain high-intensity harmonic radiation with an adjustable ellipticity, which provides an opportunity for the synthesis of circularly polarized attosecond pulses.

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Crystal-Momentum-Resolved Contributions to Harmonics in Laser-Driven Graphene

Cited by 4 publications

References 44 publications

Elliptically polarized high-order harmonic generation of Ar atom in an intense laser field

Elliptically polarized high-order harmonic generation of Ar atom in an intense laser field

Optimization of extreme ultraviolet vortex beam based on high harmonic generation

Modulation of High-Order Harmonic Generation from a Monolayer ZnO by Co-rotating Two-Color Circularly Polarized Laser Fields

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