Generation of 1020 W cm−2 hard X-ray laser pulses with two-stage reflective focusing system

Hidekazu Mimura (), Hirokatsu Yumoto, Satoshi Matsuyama, Takahisa Koyama, Kensuke Tono, Yuichi Inubushi, Tadashi Togashi, Takahiro Sato, Jangwoo Kim, Ryosuke Fukui, Yasuhisa Sano, Makina Yabashi, Haruhiko Ohashi, Tetsuya Ishikawa and Kazuto Yamauchi
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Hidekazu Mimura: Graduate School of Engineering, The University of Tokyo
Hirokatsu Yumoto: Japan Synchrotron Radiation Research Institute/SPring-8
Satoshi Matsuyama: Graduate School of Engineering, Osaka University
Takahisa Koyama: Japan Synchrotron Radiation Research Institute/SPring-8
Kensuke Tono: Japan Synchrotron Radiation Research Institute/SPring-8
Yuichi Inubushi: RIKEN SPring-8 Center
Tadashi Togashi: Japan Synchrotron Radiation Research Institute/SPring-8
Takahiro Sato: RIKEN SPring-8 Center
Jangwoo Kim: Graduate School of Engineering, Osaka University
Ryosuke Fukui: Graduate School of Engineering, Osaka University
Yasuhisa Sano: Graduate School of Engineering, Osaka University
Makina Yabashi: RIKEN SPring-8 Center
Haruhiko Ohashi: Japan Synchrotron Radiation Research Institute/SPring-8
Tetsuya Ishikawa: RIKEN SPring-8 Center
Kazuto Yamauchi: Graduate School of Engineering, Osaka University

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

Abstract: Abstract Intense X-ray fields produced with hard X-ray free-electron laser (XFEL) have made possible the study of nonlinear X-ray phenomena. However, the observable phenomena are still limited by the power density. Here, we present a two-stage focusing system consisting of ultra-precise mirrors, which can generate an extremely intense X-ray field. The XFEL beam, enlarged with upstream optics, is focused with downstream optics that have high numerical aperture. A grating interferometer is used to monitor the wavefront to achieve optimum focusing. Finally, we generate an extremely small spot of 30 × 55 nm with an extraordinary power density of over 1 × 1020 W cm−2 using 9.9 keV XFEL light. The achieved power density provides novel opportunities to elucidate unexplored nonlinear phenomena in the X-ray region, which will advance development on quantum X-ray optics, astronomical physics and high-energy density science.

Date: 2014
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DOI: 10.1038/ncomms4539

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