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Liu Z, Huang C, He T, Liao J, Li Y, Yu B. The Coulomb effect in nonsequential double ionization by counter-rotating two-color elliptical polarization fields. Phys Chem Chem Phys 2024; 26:4572-4578. [PMID: 38247378 DOI: 10.1039/d3cp05536a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
Using a three-dimensional classical ensemble model, nonsequential double ionization (NSDI) of Ar atoms by counter-rotating two-color elliptical polarization (TCEP) fields is investigated. The major axes of the two elliptical fields are aligned in different directions. The relative alignment of the two elliptical fields strongly affects the waveform of the combined electric field and the ultrafast dynamics of NSDI in TCEP fields. Numerical results show that the correlated electron momentum distributions in the x direction evolve from a V-shaped structure near the axis to a distribution concentrated on the diagonal with the angle between the two elliptical major axes increasing. The asymmetry of the energy sharing between the two electrons during recollision results in the V-shaped structure in the correlated momentum spectrum. Back analysis indicates that the recollision times of a part of the trajectories move from the peak to the valley of the combined electric field with the angle between the two elliptical major axes increasing. Therefore, for the case of a larger angle between the two elliptical major axes, the electrons experience a longer time to escape away from the vicinity of the parent ion and thus the stronger Coulomb effect from the parent ion makes the momentum difference between two electrons small, which results in a distribution concentrated on the diagonal. This provides an effective avenue to control the electron ultrafast dynamics in NSDI.
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Affiliation(s)
- Zichao Liu
- School of Physical Science and Technology and Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics, Southwest University, Chongqing 400715, China.
| | - Cheng Huang
- School of Physical Science and Technology and Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics, Southwest University, Chongqing 400715, China.
| | - Tongtong He
- School of Physical Science and Technology and Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics, Southwest University, Chongqing 400715, China.
| | - Jianying Liao
- School of Physical Science and Technology and Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics, Southwest University, Chongqing 400715, China.
| | - Yingbin Li
- College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Benhai Yu
- College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China
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2
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Yao HB, Qu QW, Zhang ZH, Wang JW, Gao J, Hu CX, Li H, Wu J, He F. Multiphoton Ionization Reduction of Atoms in Two-Color Femtosecond Laser Fields. PHYSICAL REVIEW LETTERS 2023; 130:113201. [PMID: 37001077 DOI: 10.1103/physrevlett.130.113201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 02/23/2023] [Indexed: 06/19/2023]
Abstract
We report the ionization reduction of atoms in two-color femtosecond laser fields in this joint theoretical-experimental study. For the multiphoton ionization of atoms using a 400 nm laser pulse, the ionization probability is reduced if another relatively weak 800 nm laser pulse is overlapped. Such ionization reduction consistently occurs regardless of the relative phase between the two pulses. The time-dependent Schrödinger equation simulation results indicate that with the assisted 800 nm photons the electron can be launched to Rydberg states with large angular quantum numbers, which stand off the nuclei and thus are hard to be freed in the multiphoton regime. This mechanism works for hydrogen, helium, and probably some other atoms if two-color laser fields are properly tuned.
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Affiliation(s)
- Hong-Bin Yao
- Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative innovation center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
- Key Laboratory of New Energy and Materials Research of Xinjiang Education Department, Xinjiang Institute of Engineering, Urumqi 830091, China
| | - Qi-Wen Qu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Zhao-Han Zhang
- Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative innovation center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jia-Wei Wang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Jian Gao
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
- Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing 401121, China
| | - Chen-Xi Hu
- Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative innovation center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
| | - Hui Li
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Jian Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
- Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing 401121, China
- CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
| | - Feng He
- Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative innovation center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
- CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
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3
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Chen JH, Wen LC, Zhao SF. Orbital-resolved photoelectron momentum distributions of F - ions in a counter-rotating bicircular field. OPTICS EXPRESS 2023; 31:5708-5721. [PMID: 36823844 DOI: 10.1364/oe.481153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
We present a theoretical study of the orbital-resolved photoelectron momentum distributions (PMDs) of F- ions by a two-color counter-rotating circularly polarized field. We show that the PMDs of F- ions can be modulated from an isotropic symmetric distribution into a three-lobe one by adding a weak fundamental counter-rotating field to the intense second harmonic circularly polarized field, and this modulation strongly depends on the initial atomic orbital. The PMDs simulated by the strong-field approximation method show good agreement with those obtained by solving the time-dependent Schrödinger equation. Based on the strong-field approximation method, we find that the radial momentum shift of PMDs for different orbitals is the fingerprint of orbital-dependent initial momentum at the tunnel exit. More importantly, we demonstrate that the lobes in PMDs appear in sequential order, highlighting that the scheme can be viewed as controllable rotating temporal Young's two-slit interferometer.
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Study of the effect of higher-order dispersions on photoionisation induced by ultrafast laser pulses applying a classical theoretical method. Sci Rep 2022; 12:13841. [PMID: 35974085 PMCID: PMC9381804 DOI: 10.1038/s41598-022-18034-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 08/04/2022] [Indexed: 11/16/2022] Open
Abstract
We investigated the effect of higher order dispersion on ultrafast photoionisation with Classical Trajectory Monte Carlo (CTMC) method for hydrogen and krypton atoms. In our calculations we used linearly polarised ultrashort 7 fs laser pulses, \documentclass[12pt]{minimal}
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\begin{document}$$6.5 \times 10^{14} \mathrm {W/cm^{2}}$$\end{document}6.5×1014W/cm2 intensity, and a central wavelength of 800 nm. Our results show that electrons with the highest kinetic energies are obtained with transform limited (TL) pulses. The shaping of the pulses with negative second- third- or fourth- order dispersion results in higher ionisation yield and electron energies compared to pulses shaped with positive dispersion values. We have also investigated how the Carrier Envelope Phase (CEP) dependence of the ionisation is infuenced by dispersion. We calculated the left-right asymmetry as a function of energy and CEP for sodium atoms employing pulses of 4.5 fs, 800 nm central wavelength, and \documentclass[12pt]{minimal}
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\begin{document}$$4 \times 10^{12}\mathrm {W/cm^{2}}$$\end{document}4×1012W/cm2 intensity. We found that the left-right asymmetry is more pronounced for pulses shaped with positive Group Delay Dispersion (GDD). It was also found that shaping a pulse with increasing amounts of GDD in absolute value blurs the CEP dependence, which is attributed to the increasing number of optical cycles.
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Su J, Liu Z, Liao J, Huang X, Li Y, Huang C. Electron correlation and recollision dynamics in nonsequential double ionization by counter-rotating two-color elliptically polarized laser fields. OPTICS EXPRESS 2022; 30:24898-24908. [PMID: 36237033 DOI: 10.1364/oe.462022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 06/13/2022] [Indexed: 06/16/2023]
Abstract
Nonsequential double ionization (NSDI) of Argon atoms by counter-rotating two-color elliptically polarized (TCEP) fields is investigated with a three-dimensional classical ensemble model. Different from two-color circularly polarized fields, the combined electric field in TCEP pulses has no symmetry and the ionized electron mainly returns to the parent ion from one direction. Thus the electron momentum distributions show strong asymmetry. Numerical results show with the increase of the relative phase between the two elliptical fields, the return angle of the travelling electron, i.e., the angle between the return direction of the electron and the +x direction, gradually decreases. Moreover, the dominant behavior of electron pairs evolves from anti-correlation to correlation with the relative phase increasing. This provides an avenue to control the return angle and electron correlation behavior by the relative phase between the two elliptical fields.
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Xu J, Li Y, Zhou Y, Chen Y, Li M, Yu B, Lu P. Nonsequential double ionization driven by inhomogeneous laser fields. OPTICS EXPRESS 2022; 30:15951-15962. [PMID: 36221449 DOI: 10.1364/oe.457018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 04/12/2022] [Indexed: 06/16/2023]
Abstract
With a three-dimensional classical ensemble method, we theoretically investigated the correlated electron dynamics in nonsequential double ionization (NSDI) driven by the spatially inhomogeneous fields. Our results show that NSDI in the spatially inhomogeneous fields is more efficient than that in the spatially homogeneous fields at the low laser intensities, while at the high intensities NSDI is suppressed as compared to the homogeneous fields. More interestingly, our results show that the electron pairs from NSDI exhibit a much stronger angular correlation in the spatially inhomogeneous fields, especially at the higher laser intensities. The correlated electron momentum distribution shows that in the inhomogeneous fields the electron pairs favor to achieve the same final momentum, and the distributions dominantly are clustered in the more compact regions. It is shown that the electron's momentum is focused by the inhomogeneous fields. The underlying dynamics is revealed by back-tracing the classical trajectories.
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7
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Chen Z, Su J, Zeng X, Huang X, Li Y, Huang C. Electron angular correlation in nonsequential double ionization of molecules by counter-rotating two-color circularly polarized fields. OPTICS EXPRESS 2021; 29:29576-29586. [PMID: 34615066 DOI: 10.1364/oe.439864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 08/23/2021] [Indexed: 06/13/2023]
Abstract
Electron correlation in nonsequential double ionization (NSDI) of molecules by counter-rotating two-color circularly polarized (TCCP) fields is investigated with a three-dimensional classical ensemble model. Numerical results indicate that the two electrons from NSDI of molecules in counter-rotating TCCP fields show strong angular correlation and the angular correlation behavior sensitively depends on the internuclear distance. With the internuclear distance increasing, the dominant behavior of electron pairs evolves from correlation to anti-correlation. It leaves a clear imprint on the ion momentum distributions, which exhibit an inverted Y-shape distribution at a small internuclear distance and a triangle-shape distribution at a large internuclear distance. Back analysis indicates that the asymmetric electron energy sharing by soft recollision and longer time delay of double ionization are responsible for more anti-correlated emissions at large internuclear distances.
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8
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Ge P, Fang Y, Guo Z, Ma X, Yu X, Han M, Wu C, Gong Q, Liu Y. Probing the Spin-Orbit Time Delay of Multiphoton Ionization of Kr by Bicircular Fields. PHYSICAL REVIEW LETTERS 2021; 126:223001. [PMID: 34152168 DOI: 10.1103/physrevlett.126.223001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 05/06/2021] [Indexed: 06/13/2023]
Abstract
We study multiphoton ionization of Kr atoms by circular 400-nm laser fields and probe its photoelectron circular dichroism with the weak corotating and counterrotating circular fields at 800 nm. The unusual momentum- and energy-resolved photoelectron circular dichroisms from the ^{2}P_{1/2} ionic state are observed as compared with those from ^{2}P_{3/2} ionic state. We identify an anomalous ionization enhancement at sidebands related to the ^{2}P_{1/2} ionic state on photoelectron momentum distribution when switching the relative helicity of the two fields from corotating to counterrotating. By performing the two-color intensity-continuously-varying experiments and the pump-probe experiment, we find a specific mixed-photon populated resonant transition channel in counterrotating fields that contributes to the ionization enhancement. We then probe the time delay between the two spin-orbit coupled ionic states (^{2}P_{1/2} and ^{2}P_{3/2}) using bicircular fields and reveal that the resonant transition has an insignificant effect on the relative spin-orbit time delay.
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Affiliation(s)
- Peipei Ge
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Yiqi Fang
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Zhenning Guo
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Xueyan Ma
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Xiaoyang Yu
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Meng Han
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Chengyin Wu
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Qihuang Gong
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Yunquan Liu
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
- Center for Applied Physics and Technology, HEDPS, Peking University, Beijing 100871, China
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9
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Qi H, Lian Z, Fei D, Chen Z, Hu Z. Manipulation of matter with shaped-pulse light field and its applications. ADVANCES IN PHYSICS: X 2021. [DOI: 10.1080/23746149.2021.1949390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Affiliation(s)
- Hongxia Qi
- Institute of Atomic and Molecular Physics, Jilin University, Changchun, China
- Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province, Jilin University, Changchun, China
| | - Zhenzhong Lian
- Institute of Atomic and Molecular Physics, Jilin University, Changchun, China
| | - Dehou Fei
- Institute of Atomic and Molecular Physics, Jilin University, Changchun, China
| | - Zhou Chen
- Institute of Atomic and Molecular Physics, Jilin University, Changchun, China
- Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province, Jilin University, Changchun, China
| | - Zhan Hu
- Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province, Jilin University, Changchun, China
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10
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Xu TT, Gong WJ, Zhang LL, Qi Y. Frustrated nonsequential double ionization of Ar atoms in counter-rotating two-color circular laser fields. OPTICS EXPRESS 2020; 28:35168-35178. [PMID: 33182968 DOI: 10.1364/oe.409495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 10/27/2020] [Indexed: 06/11/2023]
Abstract
We theoretically investigate the frustrated double ionization (FDI) of Ar atoms with counter-rotating two-color circular (CRTC) laser fields using the three-dimensional (3D) classical ensemble method. Our results show that the FDI probability depends upon the intensity ratio of the CRTC laser fields. The FDI event accompanied with the recollision excitation with subsequent ionization is prevalent and three pathways exist in FDI processes driven by CRTC laser fields. The momentum distribution of a recaptured electron at the ionization time after recollision indicates that the momentum being close to the vector potential is a necessary condition for FDI events to occur. In addition, the recaptured electron most probably transitions to a Rydberg state of which the quantum number is ten in the CRTC fields.
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11
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Ben S, Chen S, Bi CR, Chen J, Liu XS. Investigation of electron vortices in time-delayed circularly polarized laser pulses with a semiclassical perspective. OPTICS EXPRESS 2020; 28:29442-29454. [PMID: 33114844 DOI: 10.1364/oe.400846] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 09/06/2020] [Indexed: 06/11/2023]
Abstract
We theoretically investigate strong-filed electron vortices in time-delayed circularly polarized laser pulses by a generalized quantum-trajectory Monte Carlo (GQTMC) model. Vortex interference patterns in photoelectron momentum distributions (PMDs) with various laser parameters can be well reproduced by the semiclassical simulation. The phase difference responsible for the interference structures is analytically identified through trajectory-based analysis and simple-man theory, which reveal the underlying mechanism of electron vortex phenomena for both co-rotating and counter-rotating component. This semiclassical analysis can also demonstrate the influences of laser intensity and wavelength on the number of arms of vortices. Furthermore, we show the influence of the Coulomb effect on the PMDs. Finally, the controlling of the ionization time intervals in the tens to hundreds of attosecond magnitude is qualitatively discussed.
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Huang C, Pang H, Huang X, Zhong M, Wu Z. Relative phase effect of nonsequential double ionization of molecules by counter-rotating two-color circularly polarized fields. OPTICS EXPRESS 2020; 28:10505-10514. [PMID: 32225633 DOI: 10.1364/oe.390281] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 03/16/2020] [Indexed: 06/10/2023]
Abstract
Relative phase effect of nonsequential double ionization (NSDI) of aligned molecules by counter-rotating two-color circularly polarized (TCCP) fields is investigated with a three-dimensional classical ensemble model. Numerical results show that NSDI yield in counter-rotating TCCP fields sensitively depends on the relative phase of the two components, which exhibits a sin-like behavior with the period of π/2. NSDI yield achieves its maximum at the relative phase π/8 and minimum at 3π/8. Back analysis indicates the recollision time and the return angle of the electron strongly depend on the relative phase of the two components, which results in the dominant emission direction of the electrons, is different for different relative phases. This indicates that the recollision process can be steered by changing the relative phase of the two components in counter-rotating TCCP laser fields. Meantime, it provides an avenue to obtain information about the recollision time and the return angle in the recollision process from the electron momentum distribution.
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Li B, Yang X, Ren X, Zhang J. Enhanced double ionization rate from O 2 molecules driven by counter-rotating circularly polarized two-color laser fields. OPTICS EXPRESS 2019; 27:32700-32708. [PMID: 31684477 DOI: 10.1364/oe.27.032700] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 10/07/2019] [Indexed: 06/10/2023]
Abstract
We report that the nonsequential double ionization (NSDI) probability of an O 2 target can be enhanced greatly in a counter-rotating circularly polarized two-color driving field. The field is composed of a fundamental frequency and its third harmonic, and the combined electric field traces out a four-leaf-clover pattern. The electron ionized by such a field has more chances to collide with the valence electrons in the O 2 molecule, which significantly enhances the NSDI probability. This effect is more evident in low-intensity fields. We also find that the enhancement appears in a broad range of the field ratio of two colors and that both the NSDI yield and the underlying electronic behavior varies notably with the field ratio.
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Huang C, Zhong M, Wu Z. Nonsequential double ionization by co-rotating two-color circularly polarized laser fields. OPTICS EXPRESS 2019; 27:7616-7626. [PMID: 30876323 DOI: 10.1364/oe.27.007616] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 02/23/2019] [Indexed: 06/09/2023]
Abstract
Nonsequential double ionization (NSDI) of Ar in co-rotating two-color circularly polarized (TCCP) laser fields is investigated with a three-dimensional classical ensemble model. Our numerical results indicate that co-rotating TCCP fields can induce NSDI by recollision process, while the yield is an order of magnitude lower than counter-rotating case. NSDI yield in co-rotating TCCP fields strongly depends on field ratio of the two colors and achieves its maximum at a ratio of 2.4. In co-rotating TCCP fields, the short recollision trajectory with traveling time smaller than one cycle is dominant. Moreover, the recollision time in co-rotating TCCP laser fields depends on the field ratio, which is mapped to the electron momentum distribution. This provides anavenue to obtain information about recollision time and access the subcycle dynamics of the recollision process.
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15
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Odd electron wave packets from cycloidal ultrashort laser fields. Nat Commun 2019; 10:658. [PMID: 30737394 PMCID: PMC6368582 DOI: 10.1038/s41467-019-08601-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 01/18/2019] [Indexed: 11/08/2022] Open
Abstract
Polarization-tailored bichromatic femtosecond laser fields with cycloidal polarization profiles have emerged as a powerful tool for coherent control of quantum processes. We present an optical scheme to create and manipulate three-dimensional free electron wave packets with arbitrary rotational symmetry by combining advanced supercontinuum pulse shaping with high resolution photoelectron tomography. Here we use carrier-envelope phase-stable polarization-tailored bichromatic (3ω:4ω) counter- and corotating femtosecond laser pulses to generate 7-fold rotational symmetric and asymmetric photoelectron momentum distributions by multiphoton ionization of sodium atoms. To elucidate the physical mechanisms, we investigate the interplay between the symmetry properties of the driving field and the resulting electron wave packets by varying the optical field parameters. Our results show that the symmetry properties of electron wave packets are not fully determined by the field symmetry, but completely described by multipath quantum interference of states with different angular momenta. Laser fields can be tuned to probe electronic motion in atoms and molecules. Here the authors ionize Na atoms using bichromatic pulses to generate electron wave packets of crescent-shaped and 7-fold rotational symmetry which do not follow the field symmetry but are determined by multiphoton interference.
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16
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Ma X, Zhou Y, Chen Y, Li M, Li Y, Zhang Q, Lu P. Timing the release of the correlated electrons in strong-field nonsequential double ionization by circularly polarized two-color laser fields. OPTICS EXPRESS 2019; 27:1825-1837. [PMID: 30732230 DOI: 10.1364/oe.27.001825] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 12/21/2018] [Indexed: 06/09/2023]
Abstract
With the semiclassical ensemble model, we systematically investigate the correlated electron dynamics in strong-field nonsequential double ionization (NSDI) by the counter-rotating circularly polarized two-color (CPTC) laser pulses. Our results show that the angular distributions of the electrons in NSDI sensitively depend on the intensity ratio of the CPTC laser fields. At the small ratio, the electron pairs emit with a relative angle of about 120°, and this angle shifts to 40° as the ratio increases and finally it exhibits a wide range distribution as the intensity ratio further increases. Back analysis of the NSDI trajectories shows that this behavior results from the relative-intensity-dependence of the release time of the electron pairs in the CPTC laser fields. The release times of the electron pairs are directly mapped to the angular distribution. Our results indicate that the emission times of the correlated electrons in NSDI can be controlled with the CPTC laser fields.
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17
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Eckart S, Fehre K, Eicke N, Hartung A, Rist J, Trabert D, Strenger N, Pier A, Schmidt LPH, Jahnke T, Schöffler MS, Lein M, Kunitski M, Dörner R. Direct Experimental Access to the Nonadiabatic Initial Momentum Offset upon Tunnel Ionization. PHYSICAL REVIEW LETTERS 2018; 121:163202. [PMID: 30387676 DOI: 10.1103/physrevlett.121.163202] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 08/16/2018] [Indexed: 06/08/2023]
Abstract
We report on the nonadiabatic offset of the initial electron momentum distribution in the plane of polarization upon single ionization of argon by strong field tunneling and show how to experimentally control the degree of nonadiabaticity. Two-color counter- and corotating fields (390 and 780 nm) are compared to show that the nonadiabatic offset strongly depends on the temporal evolution of the laser electric field. We introduce a simple method for the direct access to the nonadiabatic offset using two-color counter- and corotating fields. Further, for a single-color circularly polarized field at 780 nm, we show that the radius of the experimentally observed donutlike distribution increases for increasing momentum in the light propagation direction. Our observed initial momentum offsets are well reproduced by the strong-field approximation. A mechanistic picture is introduced that links the measured nonadiabatic offset to the magnetic quantum number of virtually populated intermediate states.
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Affiliation(s)
- S Eckart
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - K Fehre
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - N Eicke
- Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany
| | - A Hartung
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - J Rist
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - D Trabert
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - N Strenger
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - A Pier
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - L Ph H Schmidt
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - T Jahnke
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - M S Schöffler
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - M Lein
- Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany
| | - M Kunitski
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
| | - R Dörner
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
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18
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Huang C, Zhong M, Wu Z. Intensity-dependent two-electron emission dynamics in nonsequential double ionization by counter-rotating two-color circularly polarized laser fields. OPTICS EXPRESS 2018; 26:26045-26056. [PMID: 30469697 DOI: 10.1364/oe.26.026045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 09/06/2018] [Indexed: 06/09/2023]
Abstract
Nonsequential double ionization of helium in counter-rotating two-color circularly polarized laser fields is investigated with a three-dimensional classical ensemble model. At moderate intensity, the momentum distribution of the two electrons shows a maximum in the middle of each side of the triangle of the negative vector potential. At high intensity, the momentum distribution exhibits a double-triangle structure, which is attributed to the different values of the laser intensity where the two electrons are released after recollision. At low intensity, the momentum distribution shows a shift deviating from the middle of the side of the triangle of the negative vector potential. This is because the first electrons are emitted within a narrow time window after the field maximum. In addition, at low intensity, double-recollision events and NSDI originating from doubly excited states induced by recollision are prevalent.
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19
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Yu WW, Ben S, Ji L, Liu YS, Guo J, Liu XS. Enhancement of nonsequential double ionization in counter-rotating two-color circularly polarized laser fields. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.05.063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Huang C, Zhong M, Wu Z. Anomalous ellipticity dependence in nonsequential double ionization of ArXe. Sci Rep 2018; 8:8772. [PMID: 29884833 PMCID: PMC5993723 DOI: 10.1038/s41598-018-27120-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 05/24/2018] [Indexed: 11/30/2022] Open
Abstract
Using a three-dimensional classical ensemble method, we present a theoretical study of nonsequential double ionization of ArXe dimer aligned along the minor axis of the elliptically polarized laser pulse. Numerical results show that NSDI probability firstly increases and then decreases with the laser ellipticity increasing, which is different from atoms. Moreover, the correlated electron momentum spectra from elliptical polarization are always asymmetric, and the asymmetry is enhanced as the ellipticity increases. Analysis backward in time indicates that in NSDI of ArXe aligned along the minor axis the recollision occurs via a semi-elliptical trajectory.
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Affiliation(s)
- Cheng Huang
- School of Physical Science and Technology, Southwest University, Chongqing, 400715, China.
| | - Mingmin Zhong
- School of Physical Science and Technology, Southwest University, Chongqing, 400715, China
| | - Zhengmao Wu
- School of Physical Science and Technology, Southwest University, Chongqing, 400715, China
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21
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Kang H, Henrichs K, Kunitski M, Wang Y, Hao X, Fehre K, Czasch A, Eckart S, Schmidt LPH, Schöffler M, Jahnke T, Liu X, Dörner R. Timing Recollision in Nonsequential Double Ionization by Intense Elliptically Polarized Laser Pulses. PHYSICAL REVIEW LETTERS 2018; 120:223204. [PMID: 29906162 DOI: 10.1103/physrevlett.120.223204] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Indexed: 06/08/2023]
Abstract
We examine correlated electron and doubly charged ion momentum spectra from strong field double ionization of neon employing intense elliptically polarized laser pulses. An ellipticity-dependent asymmetry of correlated electron and ion momentum distributions has been observed. Using a 3D semiclassical model, we demonstrate that our observations reflect the subcycle dynamics of the recollision process. Our Letter reveals a general physical picture for recollision impact double ionization with elliptical polarization and demonstrates the possibility of ultrafast control of the recollision dynamics.
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Affiliation(s)
- H Kang
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - K Henrichs
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - M Kunitski
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - Y Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - X Hao
- State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Theoretical Physics and Department of Physics, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
| | - K Fehre
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - A Czasch
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - S Eckart
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - L Ph H Schmidt
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - M Schöffler
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - T Jahnke
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
| | - X Liu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - R Dörner
- Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany
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22
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Luo S, Ma X, Xie H, Li M, Zhou Y, Cao W, Lu P. Controlling nonsequential double ionization of Ne with parallel-polarized two-color laser pulses. OPTICS EXPRESS 2018; 26:13666-13676. [PMID: 29801389 DOI: 10.1364/oe.26.013666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 05/03/2018] [Indexed: 06/08/2023]
Abstract
We measure the recoil-ion momentum distributions from nonsequential double ionization of Ne by two-color laser pulses consisting of a strong 800-nm field and a weak 400-nm field with parallel polarizations. The ion momentum spectra show pronounced asymmetries in the emission direction, which depend sensitively on the relative phase of the two-color components. Moreover, the peak of the doubly charged ion momentum distribution shifts gradually with the relative phase. The shifted range is much larger than the maximal vector potential of the 400-nm laser field. Those features are well recaptured by a semiclassical model. Through analyzing the correlated electron dynamics, we found that the energy sharing between the two electrons is extremely unequal at the instant of recollison. We further show that the shift of the ion momentum corresponds to the change of the recollision time in the two-color laser field. By tuning the relative phase of the two-color components, the recollision time is controlled with attosecond precision.
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23
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Xu TT, Zhu QY, Chen JH, Ben S, Zhang J, Liu XS. Multiple recollisions in nonsequential double ionization by counter-rotating two-color circularly polarized laser fields. OPTICS EXPRESS 2018; 26:1645-1654. [PMID: 29402036 DOI: 10.1364/oe.26.001645] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 12/28/2017] [Indexed: 06/07/2023]
Abstract
With the three-dimensional (3D) classical ensemble method, we theoretically investigate the recollision dynamics in strong-field nonsequential double ionization (NSDI) of Ar by counter-rotating two-color circularly polarized laser fields. With the analysis of the NSDI trajectories, we find that not only multiple-recollision but also single-recollision processes occur in the double ionization events. Furthermore, the multiple-recollision and single-recollision processes both undergo the recollision-induced excitation with subsequent ionization (RESI) and recollision-induced ionization (RII). The angle between the momentum and the force of the laser field at the recollision moment can affect the times of the recollision.
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24
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Lin K, Jia X, Yu Z, He F, Ma J, Li H, Gong X, Song Q, Ji Q, Zhang W, Li H, Lu P, Zeng H, Chen J, Wu J. Comparison Study of Strong-Field Ionization of Molecules and Atoms by Bicircular Two-Color Femtosecond Laser Pulses. PHYSICAL REVIEW LETTERS 2017; 119:203202. [PMID: 29219371 DOI: 10.1103/physrevlett.119.203202] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Indexed: 05/20/2023]
Abstract
We experimentally investigate the single and double ionization of N_{2} and O_{2} molecules in bicircular two-color femtosecond laser pulses, and compare with their companion atoms of Ar and Xe with comparable ionization thresholds. Electron recollision assisted enhanced ionization is observed in N_{2} and Ar by controlling the helicity and field ratio between the two colors, whereas the enhanced ionization via the recollision is almost absent in O_{2} and Xe. Our S-matrix simulations clearly reveal the crucial role of the detailed electronic structures of N_{2} and O_{2} on the two-dimensional recollision of the electrons driven by the bicircular two-color laser fields. As compared to Ar, the resonant multiphoton excitation dominates the double ionization of Xe.
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Affiliation(s)
- Kang Lin
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Xinyan Jia
- School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China
| | - Zuqing Yu
- Key Laboratory of Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
| | - Feng He
- Key Laboratory of Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
| | - Junyang Ma
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Hui Li
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Xiaochun Gong
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Qiying Song
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Qinying Ji
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Wenbin Zhang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Hanxiao Li
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Peifen Lu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Heping Zeng
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jing Chen
- HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100084, China
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China
| | - Jian Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
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25
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Kübel M, Dube Z, Naumov AY, Spanner M, Paulus GG, Kling MF, Villeneuve DM, Corkum PB, Staudte A. Streak Camera for Strong-Field Ionization. PHYSICAL REVIEW LETTERS 2017; 119:183201. [PMID: 29219565 DOI: 10.1103/physrevlett.119.183201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Indexed: 06/07/2023]
Abstract
Ionization of an atom or molecule by a strong laser field produces suboptical cycle wave packets whose control has given rise to attosecond science. The final states of the wave packets depend on ionization and deflection by the laser field, which are convoluted in conventional experiments. Here, we demonstrate a technique enabling efficient electron deflection, separate from the field driving strong-field ionization. Using a midinfrared deflection field permits one to distinguish electron wave packets generated at different field maxima of an intense few-cycle visible laser pulse. We utilize this capability to trace the scattering of low-energy electrons driven by the midinfrared field. Our approach represents a general technique for studying and controlling strong-field ionization dynamics on the attosecond time scale.
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Affiliation(s)
- M Kübel
- Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
- Department of Physics, Ludwig-Maximilians-Universität Munich, D-85748 Garching, Germany
| | - Z Dube
- Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - A Yu Naumov
- Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - M Spanner
- Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - G G Paulus
- Institute for Optics and Quantum Electronics, Universität Jena, D-07743 Jena, Germany
- Helmholtz Institute Jena, D-07743 Jena, Germany
| | - M F Kling
- Department of Physics, Ludwig-Maximilians-Universität Munich, D-85748 Garching, Germany
| | - D M Villeneuve
- Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - P B Corkum
- Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
| | - A Staudte
- Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada K1A 0R6
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26
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Dorney KM, Ellis JL, Hernández-García C, Hickstein DD, Mancuso CA, Brooks N, Fan T, Fan G, Zusin D, Gentry C, Grychtol P, Kapteyn HC, Murnane MM. Helicity-Selective Enhancement and Polarization Control of Attosecond High Harmonic Waveforms Driven by Bichromatic Circularly Polarized Laser Fields. PHYSICAL REVIEW LETTERS 2017; 119:063201. [PMID: 28949633 DOI: 10.1103/physrevlett.119.063201] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Indexed: 05/24/2023]
Abstract
High harmonics driven by two-color counterrotating circularly polarized laser fields are a unique source of bright, circularly polarized, extreme ultraviolet, and soft x-ray beams, where the individual harmonics themselves are completely circularly polarized. Here, we demonstrate the ability to preferentially select either the right or left circularly polarized harmonics simply by adjusting the relative intensity ratio of the bichromatic circularly polarized driving laser field. In the frequency domain, this significantly enhances the harmonic orders that rotate in the same direction as the higher-intensity driving laser. In the time domain, this helicity-dependent enhancement corresponds to control over the polarization of the resulting attosecond waveforms. This helicity control enables the generation of circularly polarized high harmonics with a user-defined polarization of the underlying attosecond bursts. In the future, this technique should allow for the production of bright highly elliptical harmonic supercontinua as well as the generation of isolated elliptically polarized attosecond pulses.
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Affiliation(s)
- Kevin M Dorney
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Jennifer L Ellis
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Carlos Hernández-García
- Grupo de Investigación en Aplicaciones del Láser y Fotónica, Departamento de Física Aplicada, University of Salamanca, E-37008 Salamanca, Spain
| | - Daniel D Hickstein
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Christopher A Mancuso
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Nathan Brooks
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Tingting Fan
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Guangyu Fan
- Photonics Institute, Vienna University of Technology, A-1040 Vienna, Austria
| | - Dmitriy Zusin
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Christian Gentry
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Patrik Grychtol
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Henry C Kapteyn
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
| | - Margaret M Murnane
- JILA, Department of Physics, University of Colorado Boulder and NIST, Boulder, Colorado 80309, USA
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27
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Li JB, Zhang X, Yue SJ, Wu HM, Hu BT, Du HC. Enhancement of the second plateau in solid high-order harmonic spectra by the two-color fields. OPTICS EXPRESS 2017; 25:18603-18613. [PMID: 29041058 DOI: 10.1364/oe.25.018603] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 07/17/2017] [Indexed: 06/07/2023]
Abstract
We theoretically investigate high-order harmonic generation (HHG) from solids in two-color fields. It is found that under the premise of maintaining the same amplitude, the intensity of the second plateau can be enhanced by two to three orders in a proper two-color field compared with the result in the monochromatic field with the same frequency as the driving pulse of the two-color field. This can be attributed to the fact that most excited electrons can be driven to the top of the first conduction band due to the larger vector potential of the two-color fields, which leads to the higher electron population of upper conduction bands. Moreover, we also find that isolated attosecond pulses can be generated from solids by choosing a proper two-color field that allows the electrons to reach the top of the first conduction band only once. This work provides a promising method for extending the range of solid HHG spectra in experiments.
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28
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Ben S, Guo PY, Pan XF, Xu TT, Song KL, Liu XS. Recollision induced excitation-ionization with counter-rotating two-color circularly polarized laser field. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.04.076] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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29
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Kerbstadt S, Timmer D, Englert L, Bayer T, Wollenhaupt M. Ultrashort polarization-tailored bichromatic fields from a CEP-stable white light supercontinuum. OPTICS EXPRESS 2017; 25:12518-12530. [PMID: 28786608 DOI: 10.1364/oe.25.012518] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 04/26/2017] [Indexed: 06/07/2023]
Abstract
We apply ultrafast polarization shaping to an ultrabroadband carrier envelope phase (CEP) stable white light supercontinuum to generate polarization-tailored bichromatic laser fields of low-order frequency ratio. The generation of orthogonal linearly and counter-rotating circularly polarized bichromatic fields is achieved by introducing a composite polarizer in the Fourier plane of a 4 f polarization shaper. The resulting Lissajous- and propeller-type polarization profiles are characterized experimentally by cross-correlation trajectories. The scheme provides full control over all bichromatic parameters and allows for individual spectral phase modulation of both colors. Shaper-based CEP control and the generation of tailored bichromatic fields is demonstrated. These bichromatic CEP-stable polarization-shaped ultrashort laser pulses provide a versatile class of waveforms for coherent control experiments.
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30
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Huang C, Zhong M, Wu Z. Recollision dynamics in nonsequential double ionization of atoms by long-wavelength pulses. OPTICS EXPRESS 2016; 24:28361-28371. [PMID: 27958546 DOI: 10.1364/oe.24.028361] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Recollision dynamics and electron correlation behavior are investigated for several long laser wavelengths (1200-3000 nm) in nonsequential double ionization (NSDI) of helium using three-dimensional classical ensembles. Numerical results show that for these long wavelengths NSDI events are mainly from the multiple-return trajectory which is different from the case of 800 nm. Moreover, with increasing laser wavelength NSDI events move from the diagonal to the two axes in the correlated electron momentum distributions, and finally form an experimentally observed prominent V-shaped structure [Phys. Rev. X 5, 021034 (2015)] in the first and third quadrants. Back analysis indicates that the asymmetric energy sharing between the two electrons at recollision is responsible for the formation of the prominent V-shaped structure of 3000 nm.
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31
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Hasović E, Odžak S, Becker W, Milošević D. High-order harmonic generation in non-planar molecules driven by a bicircular field. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1257830] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- E. Hasović
- Faculty of Science, University of Sarajevo , Sarajevo, Bosnia and Herzegovina
| | - S. Odžak
- Faculty of Science, University of Sarajevo , Sarajevo, Bosnia and Herzegovina
| | - W. Becker
- Max-Born-Institut , Berlin, Germany
- National Research Nuclear University MEPhI , Moscow, Russia
| | - D.B. Milošević
- Faculty of Science, University of Sarajevo , Sarajevo, Bosnia and Herzegovina
- Max-Born-Institut , Berlin, Germany
- Academy of Sciences and Arts of Bosnia and Herzegovina , Sarajevo, Bosnia and Herzegovina
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32
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Eckart S, Richter M, Kunitski M, Hartung A, Rist J, Henrichs K, Schlott N, Kang H, Bauer T, Sann H, Schmidt LPH, Schöffler M, Jahnke T, Dörner R. Nonsequential Double Ionization by Counterrotating Circularly Polarized Two-Color Laser Fields. PHYSICAL REVIEW LETTERS 2016; 117:133202. [PMID: 27715093 DOI: 10.1103/physrevlett.117.133202] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Indexed: 06/06/2023]
Abstract
We report on nonsequential double ionization of Ar by a laser pulse consisting of two counterrotating circularly polarized fields (390 and 780 nm). The double-ionization probability depends strongly on the relative intensity of the two fields and shows a kneelike structure as a function of intensity. We conclude that double ionization is driven by a beam of nearly monoenergetic recolliding electrons, which can be controlled in intensity and energy by the field parameters. The electron momentum distributions show the recolliding electron as well as a second electron which escapes from an intermediate excited state of Ar^{+}.
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Affiliation(s)
- S Eckart
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - M Richter
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - M Kunitski
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - A Hartung
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - J Rist
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - K Henrichs
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - N Schlott
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - H Kang
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - T Bauer
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - H Sann
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - L Ph H Schmidt
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - M Schöffler
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - T Jahnke
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
| | - R Dörner
- Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
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