title: Supercontinua for high-resolution absorption multiplex infrared spectroscopy.
abstract: Supercontinua generated in highly nonlinear fibers by ultrashort-pulse lasers can be used for high-resolution Fourier transform absorption spectroscopy. The practical advantages of these bright ultrabroadband light sources for spectroscopy in the near-infrared region are reported. A Cr(4+):YAG femtosecond laser broadened by an extruded soft-glass photonic crystal fiber, emitting from 1200 to 2200 nm and from 675 to 950 nm, provides a spectral radiance 1 x 10(5) times higher than that of a 3000 K blackbody and 10(2) times higher than that of synchrotron radiation. The C(2)H(2) and NH(3) overtone spectra are recorded by using this source within a few seconds.
authors.affiliation: Laboratoire de Photophysique Moléculaire, CNRS, Université Paris-Sud, Orsay Cedex, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Mandon
authors.forename: Evgeni
authors.initials: E
authors.lastname: Sorokin
authors.forename: Irina T
authors.initials: IT
authors.lastname: Sorokina
authors.forename: Guy
authors.initials: G
authors.lastname: Guelachvili
authors.forename: Nathalie
authors.initials: N
authors.lastname: Picqué