X-ray free-electron lasers are bright, femtosecond X-ray sources. Researchers have now operated one in a seeding scheme that allows X-ray pulse output approaching the single-mode ideal and produces a remarkable enhancement in monochromatic power.
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Yabashi, M., Tanaka, T. Self-seeded FEL emits hard X-rays. Nature Photon 6, 648–649 (2012). https://doi.org/10.1038/nphoton.2012.237
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DOI: https://doi.org/10.1038/nphoton.2012.237
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