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Spectral narrowing broadens applications

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Four-wave mixing near atomic resonances offers new opportunities for spectral control of extreme ultraviolet pulses.

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Fig. 1: Schematic of four-wave mixing process.

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Correspondence to John E. Beetar or Michael Chini.

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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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