Publikation: Measurement of Temporal Coherence of Free Electrons by Time-Domain Electron Interferometry
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The temporal properties of an electron beam are decisive for modern ultrafast electron microscopy and for the quantum optics of the free electron in laser fields. Here, we report a time-domain interferometer that measures and distinguishes the pure and ensemble coherences of a free-electron beam in a transmission electron microscope via symmetry-breaking shifts of photon-order sideband peaks. This result is a free-electron analog to the reconstruction of attosecond busts and photoemission delays in optical attosecond spectroscopy. We find a substantial pure electron coherence that is connected to the thermodynamics of the emitter material and a lower ensemble coherence that is governed by space-charge effects. Pure temporal coherences above 5 fs are measured at >109 electrons per second in a high-brightness beam.
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TSAREV, Maxim V., Andrey RYABOV, Peter BAUM, 2021. Measurement of Temporal Coherence of Free Electrons by Time-Domain Electron Interferometry. In: Physical Review Letters. American Physical Society (APS). 2021, 127(16), 165501. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.127.165501BibTex
@article{Tsarev2021Measu-55397, year={2021}, doi={10.1103/PhysRevLett.127.165501}, title={Measurement of Temporal Coherence of Free Electrons by Time-Domain Electron Interferometry}, number={16}, volume={127}, issn={0031-9007}, journal={Physical Review Letters}, author={Tsarev, Maxim V. and Ryabov, Andrey and Baum, Peter}, note={Article Number: 165501} }
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