Laser streaking of free electrons at 25 keV
Laser streaking of free electrons at 25 keV
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DOI：
10.1038/nphoton.2013.315
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发表时间：
2014-01-01
期刊：
影响因子：
35
通讯作者：
Baum, P.
中科院分区：
文献类型：
--
作者：
Kirchner, F. O.;Gliserin, A.;Baum, P.
在原子系统中记录电子运动需要阿秒和皮米的分辨率。目前的阿秒技术提供的光子脉冲能量范围高达100 eV，其波长太长，无法进入原子尺度的结构。相比之下，亚埃德布罗意波长的超短自由电子脉冲提供了解析亚原子结构的潜力。在这里，我们展示了一个光场驱动的条纹相机，用于它们的时间表征。我们的概念是让电子束和激光束在超薄的金属镜子上相交，并可能提供阿秒分辨率。该技术将有助于推动超快电子衍射向更高的时间分辨率发展，以追求亚原子四维成像的长期目标。作为第一个应用，我们研究了电子-电子相互作用对少电子脉冲特性的影响。
Recording electronic motion in atomic systems requires attosecond and picometre resolutions. Current attosecond technology provides photon pulses up to an energy range of 100 eV, with wavelengths far too long to access structures on the atomic scale. In contrast, ultrashort free-electron pulses with sub-Angstrom de Broglie wavelengths offer the potential to resolve sub-atomic structures. Here, we demonstrate an optical-field-driven streak camera for their temporal characterization. Our concept is to have an electron beam and a laser beam intersect at an ultrathin metal mirror, and potentially offers attosecond resolution. The technique will be instrumental in advancing ultrafast electron diffraction towards ever higher temporal resolution in the pursuit of the long-term goal of sub-atomic four-dimensional imaging. As a first application, we study the influence of electron-electron interactions on the characteristics of few-electron pulses.