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Photonics

A stable narrow-band X-ray laser

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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Figure 1: An atomic laser that uses copper's inner-shell electrons.

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Correspondence to Linda Young.

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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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