title: Spectral analog of the Gouy phase shift.
abstract: We demonstrate the existence of the spectral phase shift a pulse experiences when it is subjected to spectral focusing. This π/2 phase shift is the spectral analog of the Gouy phase shift a 2D beam experiences when it crosses its focal plane. This spectral Gouy phase shift is measured using spectral interference between a reference pulse and a negatively chirped parabolic pulse experiencing spectral focusing in a nonlinear photonic crystal fiber. To avoid inherent phase instability in the measurement, both reference and parabolic pulses are generated with a 4-f pulse shaper and copropagate in the same fiber. We measure a spectral phase shift of π/2, reaffirming its generality as a consequence of wave confinement in the spatial, temporal and spectral domains.
authors.affiliation: Institut Fresnel, CNRS, Aix-Marseille Université, Ecole Centrale Marseille, Campus de Saint Jérôme, F-13397 Marseille Cedex 20, France.
authors.forename: Esben Ravn
authors.initials: ER
authors.lastname: Andresen
authors.affiliation: Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS, Université de Bourgogne, 9 Avenue Alain Savary, 21078 Dijon, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Finot
authors.affiliation: Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Dan
authors.initials: D
authors.lastname: Oron
authors.affiliation: Institut Fresnel, CNRS, Aix-Marseille Université, Ecole Centrale Marseille, Campus de Saint Jérôme, F-13397 Marseille Cedex 20, France.
authors.forename: Hervé
authors.initials: H
authors.lastname: Rigneault