Development of portable nanofocusing optics for X-ray free-electron laser pulses.

IF 2.5 3区物理与天体物理

Journal of Synchrotron Radiation Pub Date : 2025-05-01 Epub Date: 2025-04-09 DOI:10.1107/S1600577525002279

Yuichi Inubushi, Gota Yamaguchi, Jumpei Yamada, Yuya Kubota, Ichiro Inoue, Taito Osaka, Toshinori Yabuuchi, Kensuke Tono, Makina Yabashi

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引用次数: 0

Abstract

We present the development of a portable and compact nanofocusing system utilizing Kirkpatrick-Baez optics for X-ray free-electron lasers (XFELs). The system has a total length of merely 340 mm from the initial elliptical mirror to the focal point. With this setup, we achieve focusing capabilities reaching dimensions as small as 150 nm horizontally and 220 nm vertically, resulting in an intense beam with an intensity of 2.5 × 10¹⁹ W cm^-2 for a 10 keV XFEL with a pulse energy of 110 µJ. As a demonstration of its applicability in X-ray nonlinear optics, we successfully observed an 8.64 keV Zn Kα laser by irradiating a Zn foil with the focused XFEL beam. The attained photon energy is currently the highest photon energy for amplified spontaneous emission via bound-bound transitions of electrons in the world. We anticipate that this portable and compact nanofocusing system will pave the way for new frontiers in X-ray nonlinear optics and high-energy density science, owing to its adaptability to various experimental conditions.

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用于x射线自由电子激光脉冲的便携式纳米聚焦光学系统的研制。

我们提出了一种便携式和紧凑的纳米聚焦系统利用柯克帕特里克-贝兹光学x射线自由电子激光器（XFELs）的发展。该系统从初始椭圆镜到焦点的总长度仅为340毫米。通过这种设置，我们实现了聚焦能力，水平尺寸小至150 nm，垂直尺寸小至220 nm，从而产生了强度为2.5 × 1019 W cm-2的强光束，10 keV XFEL脉冲能量为110µJ。为了证明它在x射线非线性光学中的适用性，我们成功地用聚焦的XFEL光束照射Zn箔，观察到8.64 keV Zn Kα激光器。所获得的光子能量是目前世界上通过电子的束缚跃迁放大自发发射的最高光子能量。我们预计，这种便携、紧凑的纳米聚焦系统将为x射线非线性光学和高能密度科学的新领域铺平道路，因为它能适应各种实验条件。

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来源期刊

Journal of Synchrotron Radiation INSTRUMENTS & INSTRUMENTATIONOPTICS&-OPTICS

CiteScore

5.60

自引率

12.00%

发文量

289

审稿时长

1 months

期刊介绍： Synchrotron radiation research is rapidly expanding with many new sources of radiation being created globally. Synchrotron radiation plays a leading role in pure science and in emerging technologies. The Journal of Synchrotron Radiation provides comprehensive coverage of the entire field of synchrotron radiation and free-electron laser research including instrumentation, theory, computing and scientific applications in areas such as biology, nanoscience and materials science. Rapid publication ensures an up-to-date information resource for scientists and engineers in the field.