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- W4313887617 abstract "Terahertz radiation enables the coherent excitation of many fundamental modes, such as molecular rotation, lattice vibration and spin precession. To excite the transient state of matter far out of equilibrium, high-power and tunable narrowband terahertz radiation sources have been in great demand for years. However, the terahertz source available at present cannot meet these tunability and power demands, leaving a large scientific gap that has yet to be fully explored. Here we convert the energy modulation induced by the nonlinear longitudinal space charge force to a density modulation and experimentally demonstrate the generation of electron bunch trains with modulation frequencies that are adjustable between 1 and 10 THz. The electron bunch trains can be directly used to produce tunable high-power narrowband terahertz radiation that fully covers the long-standing ‘terahertz gap’, which will open up many more possibilities in terahertz science. A tunable terahertz radiation pulse is demonstrated based on a linear accelerator. The emission frequency of this terahertz radiation is tunable from 1 to 10 THz by changing the bunching frequency of a 34 MeV electron beam. The pulse energy is at the submillijoule level." @default.
- W4313887617 created "2023-01-10" @default.
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- W4313887617 date "2023-01-09" @default.
- W4313887617 modified "2023-10-13" @default.
- W4313887617 title "Widely tunable electron bunch trains for the generation of high-power narrowband 1–10 THz radiation" @default.
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- W4313887617 doi "https://doi.org/10.1038/s41566-022-01131-7" @default.
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