Investigation of femtosecond optical delay and auto correlator in X-ray region

X射线区域飞秒光延迟和自相关器研究

• 批准号: 23360038
• 负责人: TAMASAKU Kenji
• 金额: $ 13.23万
• 依托单位: The Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23360038/
• 关键词: X線自由電子レーザー; 非線形光学; 内殻２重イオン化; ２光子吸収; パルス幅測定; X線; Ｘ線; Ｘ線自由電子レーザー; 2光子吸収

We investigate X-ray auto correlator to determine the duration of femtosecond pulses from X-ray free-electron lasers. We successfully observe double core-hole creation in krypton and direct two-photon absorption in germanium, which are indispensable two-photon processes for the auto correlator. We estimate the pulse duration to be 2.5 fs by analyzing the X-ray fluorescence spectrum from the double core-hole state. We find a competition between K-shell two-photon absorption and L-shell one-photon absorption. We analyze the pulse-energy dependence of two-photon absorption including the competition effect. Finally, we successfully reproduce the observed pulse-energy dependence, and determine the cross section of two-photon absorption. The competition determines the highest intensity for the auto correlator with two-photon absorption.

我们研究了X射线自相关器来确定来自X射线自由电子激光的飞秒脉冲的持续时间。我们成功地观测到了氪的双核空穴产生和锗的直接双光子吸收，这是自相关器不可缺少的双光子过程。通过分析双芯-孔态的X射线荧光光谱，估算出脉冲宽度为2.5fs。我们发现K壳层的双光子吸收和L壳层的单光子吸收之间存在竞争。分析了包括竞争效应在内的双光子吸收对脉冲能量的依赖关系。最后，我们成功地再现了观察到的脉冲能量依赖关系，并确定了双光子吸收截面。竞争决定了双光子吸收的自动相关器的最高强度。

项目成果

X線の2光子吸収の観測に成功 －数百ゼプト秒の間にほぼ同時に原子を2度打ち－

成功观测到X射线的双光子吸收——在几百泽秒内几乎同时撞击原子两次——

X-ray nonlinear optics at SPring-8 & SACLA

SPring-8 的 X 射线非线性光学

• 发表时间: 2013
• 作者: Atsushi Sugita;Yasuaki Sato;Kazuma Ito;Kenta Murakami;Yasuaki Tamaki;Nobuyuki Mase;Yoshimasa Kawata and Shigeru Tasaka;Kenji Tamasaku
• 通讯作者: Kenji Tamasaku

②X線を2回当てて「中空原子」の生成に世界で初めて成功-量子だるま落としで2段抜き- ホームページ等

② 世界首次成功通过两次X射线创造“空心原子” - 量子达摩大士的两步提取 - 主页等

X-ray two-photon absorption competing against single and sequential multiphoton processes

• DOI: 10.1038/nphoton.2014.10
• 发表时间: 2014-02
• 期刊: Nature Photonics
• 影响因子: 35
• 作者: K. Tamasaku;E. Shigemasa;Y. Inubushi;T. Katayama;K. Sawada;H. Yumoto;H. Ohashi;H. Mimura;M. Yabash

非線形光学現象

非线性光学现象

• 发表时间: 2012
• 作者: 安達佑亮;Xiangming Liu;富田康生;大島寿朗;中嶋琢也;河合壯;玉作賢治
• 通讯作者: 玉作賢治