Login

FEL2026 - 42nd International Free Electron Laser Conference

23–28 Aug 2026
America/Los_Angeles timezone

Contact Us

100-nm focusing of 100 eV XFEL pulses at SACLA BL1 using high-NA mirror optics

WEP01
26 Aug 2026, 17:00
1h
Poster Presentation Session 13: Science Applications Wednesday Poster Session

Speaker

Yu NAKATA (The University of Tokyo, RIKEN SPring-8 Center)

Description

Recent advances in X-ray free-electron lasers (XFEL) have opened new opportunities for X-ray nonlinear optics and transient dynamics in condensed matter*. Tight focusing of XFEL pulses is essential for generating the high intensities required for nonlinear X-ray processes and for achieving high-spatial-resolution imaging of ultrafast dynamics. However, 100-nm focusing of soft X-rays remains challenging because it requires high-numerical-aperture (high-NA) optics with extremely high fabrication accuracy.

Here, we demonstrate 100-nm focusing using a two-dimensional (2D) Wolter type-III mirror optics composed of an ellipsoidal mirror and a hyperboloidal mirror. The 2D Wolter type-III geometry enables high-NA focusing while maintaining the required fabrication accuracy. We performed a focusing experiment at SACLA BL1 using a prototype mirror pair and achieved a focal spot size of 100 nm (vertical) × 300 nm (horizontal).

Footnotes

  • Sh. Yamamoto, Phys. Rev. Lett. 120, 223902 (2018)
    ** Anton Barty, Nat. Photonics. 2, 415 (2008)
I have read and accept the Privacy Policy Statement Yes

Author

Yu NAKATA (The University of Tokyo, RIKEN SPring-8 Center)

Co-authors

Dr Yoko Takeo (The University of Tokyo, RIKEN SPring-8 Center, Japan Synchrotron Radiation Research Institute) Dr Jordan O’Neal (The University of Tokyo, RIKEN SPring-8 Center) Dr Takenori Shimamura (The University of Tokyo, RIKEN SPring-8 Center, Japan Synchrotron Radiation Research Institute) Dr Gota Yamaguchi (RIKEN SPring-8 Center) Dr Kai Sakurai (The University of Tokyo, RIKEN SPring-8 Center, Japan Synchrotron Radiation Research Institute) Mr Kyota Yoshinaga (The University of Tokyo, RIKEN SPring-8 Center, Japan Synchrotron Radiation Research Institute) Mr Yuichi Nagayama (The University of Tokyo, RIKEN SPring-8 Center) Dr Owada Shigeki (RIKEN SPring-8 Center, Japan Synchrotron Radiation Research Institute) Mr Hikaru Kishimoto (Japan Synchrotron Radiation Research Institute) Dr Takehiro Kume (NATSUME OPTICAL CORPORATION) Dr Yusuke Matsuzawa (NATSUME OPTICAL CORPORATION) Mr Kentaro Hiraguri (NATSUME OPTICAL CORPORATION) Mr Hirokazu Hashizume (NATSUME OPTICAL CORPORATION) Dr Yasunori Senba (Japan Synchrotron Radiation Research Institute) Dr Haruhiko Ohashi (Japan Synchrotron Radiation Research Institute) Makina Yabashi (Japan Synchrotron Radiation Research Institute) Prof. Takashi Kimura (The University of Tokyo, RIKEN SPring-8 Center)

Presentation materials

There are no materials yet.