title: Polarized multiplex coherent anti-Stokes Raman scattering using a picosecond laser and a fiber supercontinuum.
abstract: We perform multiplex coherent anti-Stokes Raman scattering (CARS) micro-spectroscopy with a picosecond pulsed laser and a broadband supercontinuum (SC) generated in photonic crystal fiber. CARS signal stability is achieved using an active fiber coupler that avoids thermal and mechanical drifts. We obtain multiplex CARS spectra for test liquids in the 600-2000 cm(-1) spectral range. In addition we investigate the polarization dependence of the CARS spectra when rotating the pump beam linear polarization state relative to the linearly polarized broad stokes SC. From these polarization measurements we deduce the Raman depolarization ratio, the resonant versus nonresonant contribution, the Raman resonance frequency, and the linewidth.
authors.affiliation: Institut Fresnel, Aix-Marseille Université, CNRS, Ecole Centrale Marseille, Campus de Saint Jérôme, F-13397 Marseille cedex 20, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Michel
authors.forename: Antoine
authors.initials: A
authors.lastname: Courjaud
authors.forename: Eric
authors.initials: E
authors.lastname: Mottay
authors.forename: Christophe
authors.initials: C
authors.lastname: Finot
authors.forename: John
authors.initials: J
authors.lastname: Dudley
authors.forename: Hervé
authors.initials: H
authors.lastname: Rigneault
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007089:Image Enhancement / Q000295:instrumentation*; D007834:Lasers; D008859:Microscopy, Polarization / Q000295:instrumentation*; D010363:Pattern Recognition, Automated / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*