Transition of the generation mechanism of high-order harmonics in an extended neon system

Gao Jingli; Ye Difa; Liu Jie; Kang Wei

doi:10.1063/5.0085861

Volume 7 Issue 4

Jul. 2022

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Gao Jingli, Ye Difa, Liu Jie, Kang Wei. Transition of the generation mechanism of high-order harmonics in an extended neon system[J]. Matter and Radiation at Extremes, 2022, 7(4): 044403. doi: 10.1063/5.0085861

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Gao Jingli, Ye Difa, Liu Jie, Kang Wei. Transition of the generation mechanism of high-order harmonics in an extended neon system[J]. Matter and Radiation at Extremes, 2022, 7(4): 044403. doi: 10.1063/5.0085861

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Transition of the generation mechanism of high-order harmonics in an extended neon system

doi: 10.1063/5.0085861

Gao Jingli¹,
Ye Difa²,
Liu Jie^{1, 3
,},
Kang Wei^{1
,
,
,}

1.
HEDPS, Center for Applied Physics and Technology and College of Engineering, Peking University, Beijing 100871, China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
3.
Graduate School, China Academy of Engineering Physics, Beijing 100193, China

More Information

Corresponding author: a)Author to whom correspondence should be addressed: weikang@pku.edu.cn
Received Date: 2022-01-19
Accepted Date: 2022-06-16

Available Online: 2022-07-01

Publish Date: 2022-07-01

Abstract

Abstract

Using a time-dependent density functional theory method, we perform a systematic numerical study of the transition of high-order harmonic generation in neon (Ne) systems from an isolated Ne atom to an extended Ne system of solid density. We show that ionized electrons wander in such extended systems until they meet a nearby ion and collide with it. The maximum energy edge for the main feature of the high-order harmonic spectrum in this “wandering electron” picture is determined as E_edge = I_p + 8U_p, where I_p is the ionization energy of Ne and U_p is the ponderomotive energy delivered by the driving laser. The factor of 8 comes from the maximum kinetic energy of an ionized electron in the driving laser field. Beyond the atomic limit of high-order harmonic spectra, a multiplatform feature is observed, corresponding to re-collisions of ionized electrons with their nearby ions. It is also shown that a Ne simple cubic lattice of appropriate size provides a selection condition for the direction of polarization of high-order harmonics beyond the atomic limit, which may be further used to manipulate the emitted radiation.

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References(62)

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