Abstract
We demonstrate the generation and optical control of ultrashort high-coherence electron pulses. The free-electron quantum state is phase-modulated in the longitudinal and transverse dimensions, and the formation of attosecond electron pulse trains is quantitatively probed.
Highlights
Utilizing a stroboscopic approach, ultrafast electron diffraction [1] and microscopy [2, 3] techniques provide for a unique access to nanoscale processes on ultrashort time scales
We describe the implementation of an advanced ultrafast transmission electron microscopy (UTEM) instrument utilizing lasertriggered field emitters and discuss its application in the active manipulation of freeelectron quantum states
The Göttingen UTEM instrument is based on a JEOL 2100F Schottky field emission TEM, which we modified to allow for optical sample excitation and the generation of ultrashort electron pulses (Fig. 1a) [5, 6]
Summary
Ultrafast electron diffraction [1] and microscopy [2, 3] techniques provide for a unique access to nanoscale processes on ultrashort time scales. The optical manipulation of the free-electron beam in UTEM in its transverse and longitudinal dimensions promises a significant further enhancement of the technique by facilitating all-optical electron phase plates [4] and a temporal resolution in the attosecond regime. We describe the implementation of an advanced UTEM instrument utilizing lasertriggered field emitters and discuss its application in the active manipulation of freeelectron quantum states.
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