Few-femtosecond phase-sensitive detection of infrared electric fields with a third-order nonlinearity

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Communications Physics. Springer. 2023, 6(1), 145. eISSN 2399-3650. Available under: doi: 10.1038/s42005-023-01269-y
Zusammenfassung

Measuring an electric field waveform beyond radio frequencies is often accomplished via a second-order nonlinear interaction with a laser pulse shorter than half of the field’s oscillation period. However, synthesizing such a gate pulse is extremely challenging when sampling mid- (MIR) and near- (NIR) infrared transients. Here, we demonstrate an alternative approach: a third-order nonlinear interaction with a relatively long multi-cycle pulse directly retrieves an electric-field transient whose central frequency is 156 THz. A theoretical model, exploring the different nonlinear frequency mixing processes, accurately reproduces our results. Furthermore, we demonstrate a measurement of the real part of a sample’s dielectric function, information that is challenging to retrieve in time-resolved spectroscopy and is therefore often overlooked. Our method paves the way towards experimentally simple MIR-to-NIR time-resolved spectroscopy that simultaneously extracts the spectral amplitude and phase information, an important extension of optical pump-probe spectroscopy of, e.g., molecular vibrations and fundamental excitations in condensed-matter physics.

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ISO 690KEMPF, Hannes, Philipp SULZER, Andreas LIEHL, Alfred LEITENSTORFER, Ron TENNE, 2023. Few-femtosecond phase-sensitive detection of infrared electric fields with a third-order nonlinearity. In: Communications Physics. Springer. 2023, 6(1), 145. eISSN 2399-3650. Available under: doi: 10.1038/s42005-023-01269-y
BibTex
@article{Kempf2023-06-20Fewfe-67474,
  year={2023},
  doi={10.1038/s42005-023-01269-y},
  title={Few-femtosecond phase-sensitive detection of infrared electric fields with a third-order nonlinearity},
  number={1},
  volume={6},
  journal={Communications Physics},
  author={Kempf, Hannes and Sulzer, Philipp and Liehl, Andreas and Leitenstorfer, Alfred and Tenne, Ron},
  note={Deutsche Forschungsgemeinschaft (DFG)—Project-ID 425217212—SFB 1432 Article Number: 145}
}
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