Generating coherent X-rays with short-wavelength lasers has been a long-standing goal in X-ray science. Previously, an atomic laser based on neon atoms and pumped by an X-ray free-electron laser had been developed for soft X-rays. Hitoki Yoneda et al. use a solid copper target to achieve an atomic laser in the hard X-ray regime, at 1.54 Å. The target is ionized by SACLA, the SPring-8 Angstrom Compact Free Electron Laser, to achieve strong amplified spontaneous emission. The resulting atomic laser generates an X-ray beam that is superior to the pumping X-ray free-electron laser pulse. Its wavelength is almost ten times shorter than previously reported and will open many opportunities for ultrafast X-ray spectroscopy and quantum optics.
- A stable narrow-band X-ray laser (News & Views p424, doi: 10.1038/524424a)
- Atomic inner-shell laser at 1.5-ångström wavelength pumped by an X-ray free-electron laser (Letter p446, doi: 10.1038/nature14894)
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