Duration of ultrashort pulses in the presence of spatio-temporal coupling

Charles Bourassin-Bouchet (1) , Michele Stephens (1, 2) , Sébastien de Rossi (1) , Franck Delmotte (1) , Pierre Chavel (1)

1 Laboratoire Charles Fabry de l'Institut d'Optique / Scop
2 Department of Physics [Ann Arbor]

We report on a simple method allowing one to decompose the duration of arbitrary ultrashort light pulses, potentially distorted by space-time coupling, into four elementary durations. Such a decomposition shows that, in linear optics, a spatio-temporal pulse can be stretched with respect to its Fourier limit by only three independent phenomena: nonlinear frequency dependence of the spectral phase over the whole spatial extent of the pulse, spectral amplitude inhomogeneities in space, and spectral phase inhomogeneities in space. We illustrate such a decomposition using numerical simulations of complex spatio-temporal femtosecond and attosecond pulses. Finally we show that the contribution of two of these three effects to the pulse duration is measurable without any spectral phase characterization.

Domaines: Optique [physics.optics]

Charles Bourassin-Bouchet, Michele Stephens, Sébastien de Rossi, Franck Delmotte, Pierre Chavel. Duration of ultrashort pulses in the presence of spatio-temporal coupling. Optics Express, 2011, 19 (18), pp.17357. ⟨hal-00617660⟩