Four-wave mixing near atomic resonances offers new opportunities for spectral control of extreme ultraviolet pulses.
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Beetar, J.E., Chini, M. Spectral narrowing broadens applications. Nat. Photonics 15, 249–251 (2021). https://doi.org/10.1038/s41566-021-00784-0
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DOI: https://doi.org/10.1038/s41566-021-00784-0