Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation
High-order harmonic generation is a nonlinear process that converts the gained energy during light-matter interaction into high-frequency radiation, thus resulting in the generation of coherent attosecond pulses in the XUV and soft x-ray regions. Here, we propose a control scheme for enhancing the e...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/12/6/610 |
| _version_ | 1827691474425217024 |
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| author | Abdelmalek Taoutioui Hicham Agueny |
| author_facet | Abdelmalek Taoutioui Hicham Agueny |
| author_sort | Abdelmalek Taoutioui |
| collection | DOAJ |
| description | High-order harmonic generation is a nonlinear process that converts the gained energy during light-matter interaction into high-frequency radiation, thus resulting in the generation of coherent attosecond pulses in the XUV and soft x-ray regions. Here, we propose a control scheme for enhancing the efficiency of HHG process induced by an intense near-infrared (NIR) multi-cycle laser pulse. The scheme is based on introducing an infrared (IR) single-cycle pulse and exploiting its characteristic feature that manifests by a non-zero displacement effect to generate high-photon energy. The proposed scenario is numerically implemented on the basis of the time-dependent Schrödinger equation. In particular, we show that the combined pulses allow one to produce high-energy plateaus and that the harmonic cutoff is extended by a factor of 3 compared to the case with the NIR pulse alone. The emerged high-energy plateaus is understood as a result of a vast momentum transfer from the single-cycle field to the ionized electrons while travelling in the NIR field, thus leading to high-momentum electron recollisions. We also identify the role of the IR single-cycle field for controlling the directionality of the emitted electrons via the IR-field induced electron displacement effect. We further show that the emerged plateaus can be controlled by varying the relative carrier-envelope phase between the two pulses as well as the wavelengths. Our findings pave the way for an efficient control of light-matter interaction with the use of assisting femtosecond single-cycle fields. |
| first_indexed | 2024-03-10T11:01:16Z |
| format | Article |
| id | doaj.art-2f6c4d19bf63411d8083459a84013422 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T11:01:16Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-2f6c4d19bf63411d8083459a840134222023-11-21T21:26:57ZengMDPI AGMicromachines2072-666X2021-05-0112661010.3390/mi12060610Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic GenerationAbdelmalek Taoutioui0Hicham Agueny1Institute for Nuclear Research (ATOMKI), 4026 Debrecen, HungaryDepartment of Physics and Technology, University of Bergen, Allegt. 55, N-5007 Bergen, NorwayHigh-order harmonic generation is a nonlinear process that converts the gained energy during light-matter interaction into high-frequency radiation, thus resulting in the generation of coherent attosecond pulses in the XUV and soft x-ray regions. Here, we propose a control scheme for enhancing the efficiency of HHG process induced by an intense near-infrared (NIR) multi-cycle laser pulse. The scheme is based on introducing an infrared (IR) single-cycle pulse and exploiting its characteristic feature that manifests by a non-zero displacement effect to generate high-photon energy. The proposed scenario is numerically implemented on the basis of the time-dependent Schrödinger equation. In particular, we show that the combined pulses allow one to produce high-energy plateaus and that the harmonic cutoff is extended by a factor of 3 compared to the case with the NIR pulse alone. The emerged high-energy plateaus is understood as a result of a vast momentum transfer from the single-cycle field to the ionized electrons while travelling in the NIR field, thus leading to high-momentum electron recollisions. We also identify the role of the IR single-cycle field for controlling the directionality of the emitted electrons via the IR-field induced electron displacement effect. We further show that the emerged plateaus can be controlled by varying the relative carrier-envelope phase between the two pulses as well as the wavelengths. Our findings pave the way for an efficient control of light-matter interaction with the use of assisting femtosecond single-cycle fields.https://www.mdpi.com/2072-666X/12/6/610femtosecond laser pulsescoherent controlcarrier-envelope phasehigh-harmonic spectroscopyhigh-energy plateaus |
| spellingShingle | Abdelmalek Taoutioui Hicham Agueny Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation Micromachines femtosecond laser pulses coherent control carrier-envelope phase high-harmonic spectroscopy high-energy plateaus |
| title | Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation |
| title_full | Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation |
| title_fullStr | Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation |
| title_full_unstemmed | Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation |
| title_short | Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation |
| title_sort | femtosecond single cycle pulses enhanced the efficiency of high order harmonic generation |
| topic | femtosecond laser pulses coherent control carrier-envelope phase high-harmonic spectroscopy high-energy plateaus |
| url | https://www.mdpi.com/2072-666X/12/6/610 |
| work_keys_str_mv | AT abdelmalektaoutioui femtosecondsinglecyclepulsesenhancedtheefficiencyofhighorderharmonicgeneration AT hichamagueny femtosecondsinglecyclepulsesenhancedtheefficiencyofhighorderharmonicgeneration |