title: Removing cross-phase modulation from midinfrared chirped-pulse upconversion spectra.
abstract: We observe that narrow spectral features in mid-infrared spectra obtained by chirped-pulse up-conversion are strongly distorted by cross-phase modulation between the mid-infrared field and the chirped pulse. We discuss the consequences of this effect on spectral resolution, and introduce a correction method that recovers masked lines. This simple correction can be applied either when the upconverted field is fully characterized, such as in multidimensional spectroscopy, or when causality can be used, such as in absorption spectroscopy, which we demonstrate experimentally.
authors.affiliation: Laboratoire d'Optique et Biosciences, Ecole Polytechnique Centre National de la Recherche Scientifique, 91128 Palaiseau, France.
authors.forename: Kevin F
authors.initials: KF
authors.lastname: Lee
authors.forename: Patrick
authors.initials: P
authors.lastname: Nuernberger
authors.forename: Adeline
authors.initials: A
authors.lastname: Bonvalet
authors.forename: Manuel
authors.initials: M
authors.lastname: Joffre