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Showing 1–13 of 13 results
Advanced filters: Author: Hirokatsu Yumoto Clear advanced filters

  • X-ray-free electron lasers produce X-ray pulses for use in applications such as the determination of molecular structures or the study of materials. Here, Mimura and colleagues demonstrate a two-stage focusing scheme to achieve unprecedented laser power densities of over 1020 W cm−2.

    • Hidekazu Mimura
    • Hirokatsu Yumoto
    • Kazuto Yamauchi
    Research
    Nature Communications
    Volume: 5, P: 1-5

  • Saturable absorption is a widely used process in optical-wavelength laser technologies that arises when the transmittance of a material increases upon high-intensity light illumination. Here, Yoneda et al.tightly focus free-electron laser light and demonstrate hard X-ray saturable absorption in iron.

    • Hitoki Yoneda
    • Yuichi Inubushi
    • Hikaru Kitamura
    Research
    Nature Communications
    Volume: 5, P: 1-5

  • The subtle distortion in atomic structure underlies the drastic changes in the properties of amorphous phase-change materials. Here authors show that that pressure can reverse the Peierls-like distortions introduced by temperature, eliciting a polyamorphic transition in GeTe and GeSe.

    • Tomoki Fujita
    • Yuhan Chen
    • Shuai Wei
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-10

  • X-ray sources such as free-electron lasers offer the potential to study matter at unprecedented spatial and temporal resolution. But that potential is limited by the poor quality of conventional X-ray optical elements. An in situ technique that corrects for wavefront aberrations and allows X-rays to be focused to a spot just 7 nm wide could provide a solution.

    • Hidekazu Mimura
    • Soichiro Handa
    • Kazuto Yamauchi
    Research
    Nature Physics
    Volume: 6, P: 122-125

  • The first observation of a third-order process induced by an X-ray beam from a free-electron laser is realized in germanium using a 5.6-keV X-ray beam. Two-photon absorption is confirmed, suggesting that X-ray analogues of other third-order nonlinear processes may be available for exploitation in X-ray experiments.

    • Kenji Tamasaku
    • Eiji Shigemasa
    • Tetsuya Ishikawa
    Research
    Nature Photonics
    Volume: 8, P: 313-316

  • Researchers focus 10 keV X-ray free-electron laser radiation to an area of 0.95 µm × 1.20 µm with near-100%-efficiency using reflective optics. This approach increases the fluence by a factor of 40,000 and provides a power density of 6 × 1017 W cm−2.

    • Hirokatsu Yumoto
    • Hidekazu Mimura
    • Kazuto Yamauchi
    Research
    Nature Photonics
    Volume: 7, P: 43-47

  • Understanding the structural origin of the anomalous properties of SiO2 liquid and glass at high pressures is fundamental in wide range of scientific fields. Here, the authors find experimental evidence of a bimodal behavior in the translational order of silicon’s second shell and breaking of local tetrahedral symmetry in SiO2 glass under pressure.

    • Yoshio Kono
    • Koji Ohara
    • Makina Yabashi
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-8

  • Researchers focused hard X-rays from a free-electron laser down to transverse dimensions of ~7 nm × 7 nm, enabling a two-order increase in intensity of photons and yielding access to the elusive 1022 W cm−2 regime. Such intense, short-wavelength electromagnetic radiation may probe atomic, molecular and optical physics with extremely high resolution.

    • Jumpei Yamada
    • Satoshi Matsuyama
    • Kazuto Yamauchi
    Research
    Nature Photonics
    Volume: 18, P: 685-690