Raman depolarization ratio of liquids probed by linear polarization coherent anti-Stokes Raman spectroscopy

We present a simple analytical model to describe the linear polarization coherent anti‐Stokes Raman scattering (CARS) spectroscopy. In this scheme, the pump and Stokes beams can have arbitrary linear polarization states and the CARS emitted signal is analyzed along two perpendicular directions. We c...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2009-07, Vol.40 (7), p.775-780
Main Authors: Munhoz, F., Brustlein, S., Gachet, D., Billard, F., Brasselet, S., Rigneault, H.
Format: Article
Language:English
Subjects:
CARS
Coherent scattering
Depolarization
Electronics
Linear polarization
Mathematical models
microscopy
Optics
Physics
polarization
Raman scattering
Raman spectroscopy
spectroscopy
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Summary:We present a simple analytical model to describe the linear polarization coherent anti‐Stokes Raman scattering (CARS) spectroscopy. In this scheme, the pump and Stokes beams can have arbitrary linear polarization states and the CARS emitted signal is analyzed along two perpendicular directions. We concentrate on isotropic media without electronic resonances and show that only two polarization CARS measurements performed at the peak and the dip of a CARS spectrum are sufficient to deduce the Raman depolarization ratio, the resonant versus nonresonant contribution, the Raman resonance frequency and the linewidth. We demonstrate the applicability of our scheme to toluene and cyclohexane solutions. Copyright © 2009 John Wiley & Sons, Ltd. A simple analytic model of linear polarization coherent anti‐Stokes Raman scattering spectroscopy is developed. In this scheme, the pump and Stokes beams can have arbitrary and independent linear polarization states and the anti‐Stokes emitted signal is analyzed along two perpendicular directions. This model enables us to measure all the spectroscopic CARS parameters, including the Raman depolarization ratio. We demonstrate the applicability of our scheme to toluene and cyclohexane solutions.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.2289