An atomic laser operating at the shortest wavelength yet achieved has been created by bombarding a copper foil with two X-ray pulses tuned to slightly different energies. The results may lead to ultrastable X-ray lasers. See Letter p.446
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Young, L. A stable narrow-band X-ray laser. Nature 524, 424–425 (2015). https://doi.org/10.1038/524424a
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DOI: https://doi.org/10.1038/524424a
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