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.
© 2012 Optical Society of AmericaFull Article | PDF Article
More Like This
Brandon R. Bachler, Martin E. Fermann, and Jennifer P. Ogilvie
Opt. Express 20(2) 835-844 (2012)
T. Ideguchi, A. Poisson, G. Guelachvili, T. W. Hänsch, and N. Picqué
Opt. Lett. 37(23) 4847-4849 (2012)
Opt. Lett. 16(11) 838-839 (1991)