Continuous terahertz band coverage through precise electron-beam tailoring in free-electron lasers
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作者
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
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刊物名称
NATURE PHOTONICS
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年、卷、文献号
2025, ,
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关键词
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
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摘要
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 demonstrate a novel free-electron laser approach that overcomes these limitations by premodulating 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 30.8 THz, achieving pulse energies up to 385 mu J\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\upmu {\rm{J}}$$\end{document} and 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.
