2026-05-20 理化学研究所,高輝度光科学研究センター,大阪大学
背景信号排除の概念と実証結果
＜関連情報＞
- https://www.riken.jp/press/2026/20260520_3/index.html
- https://journals.aps.org/prl/abstract/10.1103/3743-3h2l
フェムト秒X線パルスにおけるバックグラウンドフリー強度自己相関 Background-Free Intensity Autocorrelation for Femtosecond X-Ray Pulses
Taito Osaka, Shotaro Matsumura, Masafumi Miyake, Yasuhisa Sano, Ichiro Inoue, Yuichi Inubushi, Kensuke Tono, Kenji Tamasaku, and Makina Yabashi
Physical Review Letters Published: 12 May, 2026
DOI: https://doi.org/10.1103/3743-3h2l
Abstract
A background-free intensity autocorrelation measurement for 10-keV femtosecond x-ray pulses is demonstrated using x-ray second harmonic generation. The narrow phase-matching condition of x-ray second harmonic generation allows for the selective generation of either the autocorrelation or background signals in a quasicollinear geometry with a crossing angle of ∼300 μrad, achieving a geometric time resolution of ∼1 attosecond. The measured autocorrelation traces exhibit zero background and clearly reveal temporal modifications through an Si(311) monochromator, verifying x-ray temporal shaping with perfect crystals. The applicability of this method to attosecond x-ray pulses is also discussed.
