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Measurement of Temporal Coherence of Free Electrons by Time-Domain Electron Interferometry

Measurement of Temporal Coherence of Free Electrons by Time-Domain Electron Interferometry

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TSAREV, Maxim, 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). 127(16), 165501. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.127.165501

@article{Tsarev2021Measu-55397, title={Measurement of Temporal Coherence of Free Electrons by Time-Domain Electron Interferometry}, year={2021}, doi={10.1103/PhysRevLett.127.165501}, number={16}, volume={127}, issn={0031-9007}, journal={Physical Review Letters}, author={Tsarev, Maxim and Ryabov, Andrey and Baum, Peter}, note={Article Number: 165501} }

2021-10-27T08:22:17Z Measurement of Temporal Coherence of Free Electrons by Time-Domain Electron Interferometry Baum, Peter Baum, Peter 2021-10-27T08:22:17Z Tsarev, Maxim 2021 Ryabov, Andrey Tsarev, Maxim Ryabov, Andrey eng 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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