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- W4381432017 abstract "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. The new 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." @default.
- W4381432017 created "2023-06-21" @default.
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- W4381432017 date "2023-06-20" @default.
- W4381432017 modified "2023-10-10" @default.
- W4381432017 title "Few-femtosecond phase-sensitive detection of infrared electric fields with a third-order nonlinearity" @default.
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- W4381432017 doi "https://doi.org/10.1038/s42005-023-01269-y" @default.
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