Atomic inner-shell laser at 1.5-ångström wavelength pumped by an X-ray free-electron laser View Full Text


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Article Info

DATE

2015-08

AUTHORS

Hitoki Yoneda, Yuichi Inubushi, Kazunori Nagamine, Yurina Michine, Haruhiko Ohashi, Hirokatsu Yumoto, Kazuto Yamauchi, Hidekazu Mimura, Hikaru Kitamura, Tetsuo Katayama, Tetsuya Ishikawa, Makina Yabashi

ABSTRACT

Since the invention of the first lasers in the visible-light region, research has aimed to produce short-wavelength lasers that generate coherent X-rays; the shorter the wavelength, the better the imaging resolution of the laser and the shorter the pulse duration, leading to better temporal resolution in probe measurements. Recently, free-electron lasers based on self-amplified spontaneous emission have made it possible to generate a hard-X-ray laser (that is, the photon energy is of the order of ten kiloelectronvolts) in an ångström-wavelength regime, enabling advances in fields from ultrafast X-ray spectrosopy to X-ray quantum optics. An atomic laser based on neon atoms and pumped by a soft-X-ray (that is, a photon energy of less than one kiloelectronvolt) free-electron laser has been achieved at a wavelength of 14 nanometres. Here, we use a copper target and report a hard-X-ray inner-shell atomic laser operating at a wavelength of 1.5 ångströms. X-ray free-electron laser pulses with an intensity of about 10(19) watts per square centimetre tuned to the copper K-absorption edge produced sufficient population inversion to generate strong amplified spontaneous emission on the copper Kα lines. Furthermore, we operated the X-ray free-electron laser source in a two-colour mode, with one colour tuned for pumping and the other for the seed (starting) light for the laser. More... »

PAGES

446

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nature14894

DOI

http://dx.doi.org/10.1038/nature14894

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1019688791

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/26310765


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