title: Two-photon Fourier spectroscopy with femtosecond light pulses.
abstract: We demonstrate a Fourier spectrometer that uses intense ultrashort laser pulses. By exciting the 6S(1/2) - 8S(1/2) two-photon transition in atomic cesium vapor, we are able to measure the small hyperfine splitting of the 8S(1/2) excited state. This technique, combining a high spectral resolution with the high peak intensities available to femtosecond laser systems, may offer intriguing opportunities for the study of multiphoton transitions and for spectroscopy in the short-wavelength region.
authors.forename: M
authors.initials: M
authors.lastname: Bellini
authors.forename: A
authors.initials: A
authors.lastname: Bartoli
authors.forename: T W
authors.initials: TW
authors.lastname: Hänsch