Generation and characterization of coherent terahertz radiation from 100-TW laser-wakefield acceleration
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866917179810643968 |
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| author | Pak, Taegyu Wi, Dae Hee Kim, Sang Beom Lim, Jaewon Sung, Jae Hee Lee, Seong Ku Kim, Ki-Yong |
| author_facet | Pak, Taegyu Wi, Dae Hee Kim, Sang Beom Lim, Jaewon Sung, Jae Hee Lee, Seong Ku Kim, Ki-Yong |
| contents | We experimentally characterized terahertz (THz) radiation emitted from laser-wakefield acceleration (LWFA) driven at 100-TW laser power. Simultaneous measurements of the laser energy, electron-bunch charge, and THz energy reveal a quadratic dependence of the THz energy on both charge and laser energy. This behavior indicates coherent collective emission in the generation process and provides a useful scaling law for THz output. Microbolometer-based beam profiling shows a relatively large THz beam divergence (~0.2 rad). Single-shot THz interferometry further shows that the emitted THz pulse is sub-picosecond in duration and broadband. Combining the beam-profile and interferometric measurements, the THz spectrum is expected to span approximately 1-20 THz. Together, these results support coherent acceleration radiation as the dominant mechanism for THz generation in 100-TW LWFA. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00134 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generation and characterization of coherent terahertz radiation from 100-TW laser-wakefield acceleration Pak, Taegyu Wi, Dae Hee Kim, Sang Beom Lim, Jaewon Sung, Jae Hee Lee, Seong Ku Kim, Ki-Yong Plasma Physics Optics We experimentally characterized terahertz (THz) radiation emitted from laser-wakefield acceleration (LWFA) driven at 100-TW laser power. Simultaneous measurements of the laser energy, electron-bunch charge, and THz energy reveal a quadratic dependence of the THz energy on both charge and laser energy. This behavior indicates coherent collective emission in the generation process and provides a useful scaling law for THz output. Microbolometer-based beam profiling shows a relatively large THz beam divergence (~0.2 rad). Single-shot THz interferometry further shows that the emitted THz pulse is sub-picosecond in duration and broadband. Combining the beam-profile and interferometric measurements, the THz spectrum is expected to span approximately 1-20 THz. Together, these results support coherent acceleration radiation as the dominant mechanism for THz generation in 100-TW LWFA. |
| title | Generation and characterization of coherent terahertz radiation from 100-TW laser-wakefield acceleration |
| topic | Plasma Physics Optics |
| url | https://arxiv.org/abs/2601.00134 |