Saturable absorption of intense hard X-rays in iron

Hitoki Yoneda (), Yuichi Inubushi, Makina Yabashi (), Tetsuo Katayama, Tetsuya Ishikawa, Haruhiko Ohashi, Hirokatsu Yumoto, Kazuto Yamauchi, Hidekazu Mimura and Hikaru Kitamura
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Hitoki Yoneda: Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu
Yuichi Inubushi: RIKEN SPring-8 Center, Kouto 1-1-1
Makina Yabashi: RIKEN SPring-8 Center, Kouto 1-1-1
Tetsuo Katayama: RIKEN SPring-8 Center, Kouto 1-1-1
Tetsuya Ishikawa: RIKEN SPring-8 Center, Kouto 1-1-1
Haruhiko Ohashi: RIKEN SPring-8 Center, Kouto 1-1-1
Hirokatsu Yumoto: Japan Synchrotron Radiation Research Institute (JASRI), Kouto 1-1-1
Kazuto Yamauchi: RIKEN SPring-8 Center, Kouto 1-1-1
Hidekazu Mimura: RIKEN SPring-8 Center, Kouto 1-1-1
Hikaru Kitamura: Kyoto University, Kitashirakawa Oiwake-cho

Nature Communications, 2014, vol. 5, issue 1, 1-5

Abstract: Abstract In 1913, Maurice de Broglie discovered the presence of X-ray absorption bands of silver and bromine in photographic emulsion. Over the following century, X-ray absorption spectroscopy was established as a standard basis for element analysis, and further applied to advanced investigation of the structures and electronic states of complex materials. Here we show the first observation of an X-ray-induced change of absorption spectra of the iron K-edge for 7.1-keV ultra-brilliant X-ray free-electron laser pulses with an extreme intensity of 1020 W cm−2. The highly excited state yields a shift of the absorption edge and an increase of transparency by a factor of 10 with an improvement of the phase front of the transmitted X-rays. This finding, the saturable absorption of hard X-rays, opens a promising path for future innovations of X-ray science by enabling novel attosecond active optics, such as lasing and dynamical spatiotemporal control of X-rays.

Date: 2014
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DOI: 10.1038/ncomms6080

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