A single-pass free electron laser operating at 0.16 THz with an energy efficiency of ~10% promises compact and high-power sources in the terahertz spectral region.
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Yan, L., Liu, Z. Efficient free electron laser. Nat. Photon. 16, 404–405 (2022). https://doi.org/10.1038/s41566-022-01007-w
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DOI: https://doi.org/10.1038/s41566-022-01007-w
