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

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2021

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Physical Review Letters. American Physical Society (APS). 2021, 127(16), 165501. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.127.165501

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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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ISO 690TSAREV, 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.127.165501
BibTex
@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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