title: Raman-induced Kerr-effect dual-comb spectroscopy.
abstract: We report on the first (to our knowledge) demonstration of nonlinear dual-frequency-comb spectroscopy. In multi-heterodyne femtosecond Raman-induced Kerr-effect spectroscopy, the Raman gain resulting from the coherent excitation of molecular vibrations by a spectrally narrow pump is imprinted onto the femtosecond laser frequency comb probe spectrum. The birefringence signal induced by the nonlinear interaction of these beams and the sample is heterodyned against a frequency comb local oscillator with a repetition frequency slightly different from that of the comb probe. Such time-domain interference provides multiplex access to the phase and amplitude Raman spectra over a broad spectral bandwidth within a short measurement time.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Garching, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Ideguchi
authors.forename: B
authors.initials: B
authors.lastname: Bernhardt
authors.forename: G
authors.initials: G
authors.lastname: Guelachvili
authors.forename: T W
authors.initials: TW
authors.lastname: Hänsch
authors.forename: N
authors.initials: N
authors.lastname: Picqué