Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers
We analyze the doubly differential electron momentum distribution in above-threshold ionization of atomic hydrogen by a linearly polarized mid-infrared laser pulse. We reproduce side rings in the momentum distribution with forward-backward symmetry previously observed by Lemell et al. [Phys. Rev. A...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_24699926_v97_n5_p_Dran |
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todo:paper_24699926_v97_n5_p_Dran2023-10-03T16:41:39Z Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers Dran, M. Arbó, D.G. Infrared devices Infrared lasers Ionization Kinetic energy Kinetics Optical parametric oscillators Above-threshold ionization Electron kinetic energy Electron momentum distribution Mid-infrared laser pulse Momentum distributions Saddle-point approximation Strong-field approximations Threedimensional (3-d) Momentum We analyze the doubly differential electron momentum distribution in above-threshold ionization of atomic hydrogen by a linearly polarized mid-infrared laser pulse. We reproduce side rings in the momentum distribution with forward-backward symmetry previously observed by Lemell et al. [Phys. Rev. A 87, 013421 (2013)PLRAAN1050-294710.1103/PhysRevA.87.013421], whose origin, as far as we know, has not been explained so far. By developing a Fourier theory of moiré patterns, we demonstrate that such structures stem from the interplay between intra- and intercycle interference patterns which work as two separate grids in the two-dimensional momentum domain. We use a three-dimensional (3D) description based on the saddle-point approximation (SPA) to unravel the nature of these structures. When the periods of the two grids (intra- and intercycle) are similar, principal moiré patterns arise symmetrically as concentric rings in the forward and backward directions at high electron kinetic energy. Higher order moiré patterns are observed and characterized when the period of one grid is multiple of the other. We find a scale law for the position (in momentum space) of the center of the moiré rings in the tunneling regime. We verify the SPA predictions by comparison with time-dependent distorted-wave strong-field approximation calculations and the solutions of the full 3D time-dependent Schrödinger equation. © 2018 American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_24699926_v97_n5_p_Dran |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Infrared devices Infrared lasers Ionization Kinetic energy Kinetics Optical parametric oscillators Above-threshold ionization Electron kinetic energy Electron momentum distribution Mid-infrared laser pulse Momentum distributions Saddle-point approximation Strong-field approximations Threedimensional (3-d) Momentum |
| spellingShingle |
Infrared devices Infrared lasers Ionization Kinetic energy Kinetics Optical parametric oscillators Above-threshold ionization Electron kinetic energy Electron momentum distribution Mid-infrared laser pulse Momentum distributions Saddle-point approximation Strong-field approximations Threedimensional (3-d) Momentum Dran, M. Arbó, D.G. Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers |
| topic_facet |
Infrared devices Infrared lasers Ionization Kinetic energy Kinetics Optical parametric oscillators Above-threshold ionization Electron kinetic energy Electron momentum distribution Mid-infrared laser pulse Momentum distributions Saddle-point approximation Strong-field approximations Threedimensional (3-d) Momentum |
| description |
We analyze the doubly differential electron momentum distribution in above-threshold ionization of atomic hydrogen by a linearly polarized mid-infrared laser pulse. We reproduce side rings in the momentum distribution with forward-backward symmetry previously observed by Lemell et al. [Phys. Rev. A 87, 013421 (2013)PLRAAN1050-294710.1103/PhysRevA.87.013421], whose origin, as far as we know, has not been explained so far. By developing a Fourier theory of moiré patterns, we demonstrate that such structures stem from the interplay between intra- and intercycle interference patterns which work as two separate grids in the two-dimensional momentum domain. We use a three-dimensional (3D) description based on the saddle-point approximation (SPA) to unravel the nature of these structures. When the periods of the two grids (intra- and intercycle) are similar, principal moiré patterns arise symmetrically as concentric rings in the forward and backward directions at high electron kinetic energy. Higher order moiré patterns are observed and characterized when the period of one grid is multiple of the other. We find a scale law for the position (in momentum space) of the center of the moiré rings in the tunneling regime. We verify the SPA predictions by comparison with time-dependent distorted-wave strong-field approximation calculations and the solutions of the full 3D time-dependent Schrödinger equation. © 2018 American Physical Society. |
| format |
JOUR |
| author |
Dran, M. Arbó, D.G. |
| author_facet |
Dran, M. Arbó, D.G. |
| author_sort |
Dran, M. |
| title |
Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers |
| title_short |
Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers |
| title_full |
Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers |
| title_fullStr |
Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers |
| title_full_unstemmed |
Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers |
| title_sort |
moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers |
| url |
http://hdl.handle.net/20.500.12110/paper_24699926_v97_n5_p_Dran |
| work_keys_str_mv |
AT dranm moirepatternsindoublydifferentialelectronmomentumdistributionsinatomicionizationbymidinfraredlasers AT arbodg moirepatternsindoublydifferentialelectronmomentumdistributionsinatomicionizationbymidinfraredlasers |
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1782028684496994304 |