衍射
波包
电子衍射
飞秒
超短脉冲
光学
物理
超快电子衍射
Dirac(视频压缩格式)
驻波
衍射光栅
激光器
量子力学
中微子
作者
Kang Lin,S. Eckart,Hao Liang,Alexander Hartung,Sina Jacob,Qinying Ji,L. Ph. H. Schmidt,M. Schoeffler,T. Jahnke,Maksim Kunitski,R. Doerner
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2024-03-29
卷期号:383 (6690): 1467-1470
标识
DOI:10.1126/science.adn1555
摘要
Similar to the optical diffraction of light passing through a material grating, the Kapitza-Dirac effect occurs when an electron is diffracted by a standing light wave. In its original description the effect is time-independent. In the present work, we extend the Kapitza-Dirac concept to the time domain. By tracking the spatiotemporal evolution of a pulsed electron wave packet diffracted by a femtosecond (10 15 second) standing wave pulse in a pump-probe scheme, we observe so far unseen time-dependent diffraction patterns. The fringe spacing in the observed pattern differs from that generated by the conventional Kapitza-Dirac effect, moreover it decreases as the pump-probe delay time increases. By exploiting this time-resolved diffraction scheme, we gather access to the time evolution of the previously inaccessible phase properties of a free electron.
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