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Spatio-spectral characterization of ultrashort laser pulses with a birefringent delay line

par Jolly, Spencer W. ;Gobert, Olivier;Quéré, Fabien
Référence OSA continuum, 4, 7, page (2044)
Publication Publié, 2021-07-01

Article révisé par les pairs

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Résumé :

We utilize a birefringent delay line to perform spatially-resolved Fourier transform spectroscopy at multiple planes around the focus of an ultrashort laser pulse. Combining these measurements at multiple planes with phase-retrieval, i.e. the INSIGHT technique, allows for the determination of the three-dimensional laser field, in both amplitude and phase, lacking only the knowledge of a spatially-uniform spectral phase. We use the device to simultaneously measure two low-order spatio-temporal couplings resulting from a misaligned chromatic lens doublet. Besides being a new implementation of spatio-spectral characterization of ultrashort pulses, this technique allows for more accuracy and stability in spatio-spectral characterization and a push to shorter wavelengths, and may ultimately enable sparse measurements.