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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.16747 |
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| _version_ | 1866908801600323584 |
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| author | Trieu, Doan-An Hoang-Trong, Duong D. Le, Cam-Tu Ha, Sang Phan, Ngoc-Hung Potemkin, F. V. Le, Van-Hoang Phan, Ngoc-Loan |
| author_facet | Trieu, Doan-An Hoang-Trong, Duong D. Le, Cam-Tu Ha, Sang Phan, Ngoc-Hung Potemkin, F. V. Le, Van-Hoang Phan, Ngoc-Loan |
| contents | Extending the high-harmonic cutoff with experimentally accessible fields is essential for advancing tabletop coherent extreme ultraviolet (EUV) and soft X-ray sources. Although terahertz (THz) assistance offers a promising route, cutoff extension at weak, laboratory-accessible THz strengths remain poorly understood. In this report, we comprehensively investigate THz-assisted high-order harmonic generation (HHG) using time-dependent Schrödinger equation simulations supported by classical trajectory analysis and Bohmian-based quantum dynamics. By mapping the plateau evolution versus THz strength, we show that even weak THz fields can extend the cutoff, producing a pronounced ``fish-fin'' structure whose prominent rays saturate near $I_p + 8 U_p$. We trace this extension to long electron excursions spanning several optical cycles before recombination, and provide a fully consistent explanation using both classical analysis and Bohmian trajectories flow. Our findings reveal that this cutoff-extension mechanism is remarkably robust, persisting across different atomic species and remaining insensitive to variations in the driving parameters. These results demonstrate that cutoff control is achievable with laboratory-scale THz fields, offering practical guidelines for engineering coherent high-energy HHG, and providing a robust pathway for tracking ultrafast electron motion in real time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16747 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Moderate-terahertz-induced plateau expansion of high-order harmonic generation to soft X-ray region Trieu, Doan-An Hoang-Trong, Duong D. Le, Cam-Tu Ha, Sang Phan, Ngoc-Hung Potemkin, F. V. Le, Van-Hoang Phan, Ngoc-Loan Optics Quantum Physics Extending the high-harmonic cutoff with experimentally accessible fields is essential for advancing tabletop coherent extreme ultraviolet (EUV) and soft X-ray sources. Although terahertz (THz) assistance offers a promising route, cutoff extension at weak, laboratory-accessible THz strengths remain poorly understood. In this report, we comprehensively investigate THz-assisted high-order harmonic generation (HHG) using time-dependent Schrödinger equation simulations supported by classical trajectory analysis and Bohmian-based quantum dynamics. By mapping the plateau evolution versus THz strength, we show that even weak THz fields can extend the cutoff, producing a pronounced ``fish-fin'' structure whose prominent rays saturate near $I_p + 8 U_p$. We trace this extension to long electron excursions spanning several optical cycles before recombination, and provide a fully consistent explanation using both classical analysis and Bohmian trajectories flow. Our findings reveal that this cutoff-extension mechanism is remarkably robust, persisting across different atomic species and remaining insensitive to variations in the driving parameters. These results demonstrate that cutoff control is achievable with laboratory-scale THz fields, offering practical guidelines for engineering coherent high-energy HHG, and providing a robust pathway for tracking ultrafast electron motion in real time. |
| title | Moderate-terahertz-induced plateau expansion of high-order harmonic generation to soft X-ray region |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2601.16747 |