Few-Attosecond electron pulse trains with tunable periods produced by two counter-propagating lasers
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911685762088960 |
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| author | Huang, Qi Jia, Qing Wang, Zhongxuan Zheng, Jian |
| author_facet | Huang, Qi Jia, Qing Wang, Zhongxuan Zheng, Jian |
| contents | Attosecond electron pulses enable real-time probing of ultrafast matter dynamics, yet conventional modulation schemes suffer from drastically shortened longitudinal focal lengths when targeting sub-attosecond durations. To address this bottleneck, we propose and demonstrate a compact scheme utilizing two counter-propagating lasers that reveals a previously unidentified stable modulation regime. Contrary to established models of ponderomotive forces and stochastic acceleration in dual-laser fields, we show that a specific parametric resonance condition permits the electron beam to be stably modulated into highly periodic attosecond trains with rapid energy gain. Using a sub-relativistic electron beam, simulations confirm the generation of ~1 as pulses with a Lorentz factor up to 15 and a relative energy spread below 0.02%, extending the focal length by three orders of magnitude compared with conventional approaches. This work identifies the critical transition from ordered modulation to stochastic acceleration, offering a viable route to overcoming the focal-length barrier in attosecond electron-pulse applications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_14873 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Few-Attosecond electron pulse trains with tunable periods produced by two counter-propagating lasers Huang, Qi Jia, Qing Wang, Zhongxuan Zheng, Jian Plasma Physics Accelerator Physics Attosecond electron pulses enable real-time probing of ultrafast matter dynamics, yet conventional modulation schemes suffer from drastically shortened longitudinal focal lengths when targeting sub-attosecond durations. To address this bottleneck, we propose and demonstrate a compact scheme utilizing two counter-propagating lasers that reveals a previously unidentified stable modulation regime. Contrary to established models of ponderomotive forces and stochastic acceleration in dual-laser fields, we show that a specific parametric resonance condition permits the electron beam to be stably modulated into highly periodic attosecond trains with rapid energy gain. Using a sub-relativistic electron beam, simulations confirm the generation of ~1 as pulses with a Lorentz factor up to 15 and a relative energy spread below 0.02%, extending the focal length by three orders of magnitude compared with conventional approaches. This work identifies the critical transition from ordered modulation to stochastic acceleration, offering a viable route to overcoming the focal-length barrier in attosecond electron-pulse applications. |
| title | Few-Attosecond electron pulse trains with tunable periods produced by two counter-propagating lasers |
| topic | Plasma Physics Accelerator Physics |
| url | https://arxiv.org/abs/2605.14873 |