In-situ characterization of few-fs laser pulses by learning from first-principles calculations

Posted on 05.08.2022 - 13:41
The field of ultrafast spectroscopy is based on lasers being able to produce pulses that are as short as a few femtoseconds. Due to their broad bandwidth, these ultrashort light transients are strongly affected by propagation through materials. Therefore, a careful characterization of their temporal profile is required before any application. We propose a scheme for their characterization in-situ, ensuring that the pulse parameters are measured in the region where the interaction with the sample takes place. Our method is based on first-principles calculations for strong-field ionization of rare-gas atoms and autocorrelation. We introduce a machine-learning algorithm (VSNIC) that uses the results from the first-principles calculations as input and reconstructs from a strong-field autocorrelation pattern for an unknown pulse the pulse length and spectral width by narrow margins.

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Geffert, Otfried; Kolbasova, Daria; Trabattoni, Andrea; Calegari, Francesca; Santra, Robin (2022): In-situ characterization of few-fs laser pulses by learning from first-principles calculations. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.6052091.v7
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Optics Letters

AUTHORS (5)

Otfried Geffert
Daria Kolbasova
Andrea Trabattoni
Francesca Calegari
Robin Santra

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