Enabling Continuous THz Band Coverage via Precise Electron Beam Tailoring in Free-electron Lasers
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913772118999040 |
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| author | Kang, Yin Li, Tong Wang, Zhen Wang, Yue Yu, Cheng Yin, Weiyi Gao, Zhangfeng Xu, Hanghua Luo, Hang Wang, Xiaofan Chen, Jian Lan, Taihe Liu, Xiaoqing Wang, Jinguo Zhao, Huan Gao, Fei Sun, Liping Zhu, YanYan Wen, Yongmei Tian, Qili Xu, Chenye Wang, Xingtao Xu, Jiaqiang Qi, Zheng Liu, Tao Li, Bin Yan, Lixin Zhang, Kaiqing Feng, Chao Liu, Bo Zhao, Zhentang |
| author_facet | Kang, Yin Li, Tong Wang, Zhen Wang, Yue Yu, Cheng Yin, Weiyi Gao, Zhangfeng Xu, Hanghua Luo, Hang Wang, Xiaofan Chen, Jian Lan, Taihe Liu, Xiaoqing Wang, Jinguo Zhao, Huan Gao, Fei Sun, Liping Zhu, YanYan Wen, Yongmei Tian, Qili Xu, Chenye Wang, Xingtao Xu, Jiaqiang Qi, Zheng Liu, Tao Li, Bin Yan, Lixin Zhang, Kaiqing Feng, Chao Liu, Bo Zhao, Zhentang |
| contents | High-power, continuously tunable narrowband terahertz (THz) sources are essential for advancing nonlinear optics, THz-driven material dynamics, and ultrafast spectroscopy. Conventional techniques typically impose a trade-off between pulse energy and frequency tunability. Here, we introduce a novel free-electron laser approach that overcomes these limitations by pre-modulating a relativistic electron beam with a frequency-beating laser pulse and leveraging bunch compression along with collective effects to enhance microbunching. Experimental results demonstrate that this technique generates narrowband THz emission with continuous frequency tunability from 7.8 to 30.8THz, achieving pulse energies up to 385μJ while maintaining spectral bandwidths between 7.7% and 14.7%. Moreover, the method exhibits exceptional robustness and scalability, highlighting its unique ability to bridge the long-standing THz gap and offering a promising solution for diverse cutting-edge scientific applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_01391 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enabling Continuous THz Band Coverage via Precise Electron Beam Tailoring in Free-electron Lasers Kang, Yin Li, Tong Wang, Zhen Wang, Yue Yu, Cheng Yin, Weiyi Gao, Zhangfeng Xu, Hanghua Luo, Hang Wang, Xiaofan Chen, Jian Lan, Taihe Liu, Xiaoqing Wang, Jinguo Zhao, Huan Gao, Fei Sun, Liping Zhu, YanYan Wen, Yongmei Tian, Qili Xu, Chenye Wang, Xingtao Xu, Jiaqiang Qi, Zheng Liu, Tao Li, Bin Yan, Lixin Zhang, Kaiqing Feng, Chao Liu, Bo Zhao, Zhentang Accelerator Physics Optics High-power, continuously tunable narrowband terahertz (THz) sources are essential for advancing nonlinear optics, THz-driven material dynamics, and ultrafast spectroscopy. Conventional techniques typically impose a trade-off between pulse energy and frequency tunability. Here, we introduce a novel free-electron laser approach that overcomes these limitations by pre-modulating a relativistic electron beam with a frequency-beating laser pulse and leveraging bunch compression along with collective effects to enhance microbunching. Experimental results demonstrate that this technique generates narrowband THz emission with continuous frequency tunability from 7.8 to 30.8THz, achieving pulse energies up to 385μJ while maintaining spectral bandwidths between 7.7% and 14.7%. Moreover, the method exhibits exceptional robustness and scalability, highlighting its unique ability to bridge the long-standing THz gap and offering a promising solution for diverse cutting-edge scientific applications. |
| title | Enabling Continuous THz Band Coverage via Precise Electron Beam Tailoring in Free-electron Lasers |
| topic | Accelerator Physics Optics |
| url | https://arxiv.org/abs/2504.01391 |