Half-cycle cutoff in near-threshold harmonic generation
A half-cycle cutoff is identified in the harmonic generation spectra near the ionization potential for short driving laser pulses. Unlike the half-cycle cutoff in the high-energy region, the newly found low-energy cutoff is strongly affected by the ionic potential and multiple return trajectories. W...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2015-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/17/12/123020 |
| _version_ | 1797751050878320640 |
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| author | Wei-Hao Xiong Ji-Wei Geng Qihuang Gong Liang-You Peng |
| author_facet | Wei-Hao Xiong Ji-Wei Geng Qihuang Gong Liang-You Peng |
| author_sort | Wei-Hao Xiong |
| collection | DOAJ |
| description | A half-cycle cutoff is identified in the harmonic generation spectra near the ionization potential for short driving laser pulses. Unlike the half-cycle cutoff in the high-energy region, the newly found low-energy cutoff is strongly affected by the ionic potential and multiple return trajectories. We show their contribution clearly in the observable harmonic spectrum based on the reference of this cutoff structure. Our results are calculated from a numerical solution to the 3D time-dependent Schrödinger equation and a classical trajectory Monte Carlo method. By comparing the results from both methods, we analyze the time-dependent sub-cycle electron dynamics and provide a transparent explanation to this half-cycle cutoff. We further investigate the low-energy harmonic yield as a function of CEP for different pulse durations. The modulation depth of this yield drops rapidly when the pulse duration is increased, which can explain the CEP-dependence recently observed in the experiment. |
| first_indexed | 2024-03-12T16:42:49Z |
| format | Article |
| id | doaj.art-b90e9109a41f49da9d31ea844f592406 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:42:49Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-b90e9109a41f49da9d31ea844f5924062023-08-08T14:24:35ZengIOP PublishingNew Journal of Physics1367-26302015-01-01171212302010.1088/1367-2630/17/12/123020Half-cycle cutoff in near-threshold harmonic generationWei-Hao Xiong0Ji-Wei Geng1Qihuang Gong2Liang-You Peng3State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics , Peking University, Beijing 100871, ChinaState Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics , Peking University, Beijing 100871, ChinaState Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics , Peking University, Beijing 100871, China; Collaborative Innovation Center of Extreme Optics , Shanxi University, Taiyuan, Shanxi 030006, ChinaState Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics , Peking University, Beijing 100871, China; Collaborative Innovation Center of Extreme Optics , Shanxi University, Taiyuan, Shanxi 030006, ChinaA half-cycle cutoff is identified in the harmonic generation spectra near the ionization potential for short driving laser pulses. Unlike the half-cycle cutoff in the high-energy region, the newly found low-energy cutoff is strongly affected by the ionic potential and multiple return trajectories. We show their contribution clearly in the observable harmonic spectrum based on the reference of this cutoff structure. Our results are calculated from a numerical solution to the 3D time-dependent Schrödinger equation and a classical trajectory Monte Carlo method. By comparing the results from both methods, we analyze the time-dependent sub-cycle electron dynamics and provide a transparent explanation to this half-cycle cutoff. We further investigate the low-energy harmonic yield as a function of CEP for different pulse durations. The modulation depth of this yield drops rapidly when the pulse duration is increased, which can explain the CEP-dependence recently observed in the experiment.https://doi.org/10.1088/1367-2630/17/12/123020harmonic generationcarrier envelope phasesub-cycle electron dynamics |
| spellingShingle | Wei-Hao Xiong Ji-Wei Geng Qihuang Gong Liang-You Peng Half-cycle cutoff in near-threshold harmonic generation New Journal of Physics harmonic generation carrier envelope phase sub-cycle electron dynamics |
| title | Half-cycle cutoff in near-threshold harmonic generation |
| title_full | Half-cycle cutoff in near-threshold harmonic generation |
| title_fullStr | Half-cycle cutoff in near-threshold harmonic generation |
| title_full_unstemmed | Half-cycle cutoff in near-threshold harmonic generation |
| title_short | Half-cycle cutoff in near-threshold harmonic generation |
| title_sort | half cycle cutoff in near threshold harmonic generation |
| topic | harmonic generation carrier envelope phase sub-cycle electron dynamics |
| url | https://doi.org/10.1088/1367-2630/17/12/123020 |
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