Open AccessNew treatment of CARS spectrum to determine the Raman depolarization ratio
Author(s) -
Yuanqin Yu,
Kuo-Cheng Lin,
Ye Feng,
Zhou Xiao-Guo,
Shilin Liu,
Xingxiao Ma
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.2699
Subject(s) - raman spectroscopy , depolarization ratio , polarization (electrochemistry) , depolarization , raman scattering , amplitude , optics , stokes parameters , physics , coherent anti stokes raman spectroscopy , excitation , spectral line , atomic physics , materials science , molecular physics , scattering , chemistry , quantum mechanics , medicine , endocrinology
The Raman depolarization ratio ρ can be determined accurately by polarization-resolved coherent anti-stokes scattering (CARS) technique (J. Raman Spectrosc., 2000, 31: 725). The polarized CARS spectra are recorded at a series of polarization angles φd, and simulated by a Lorentz bandshape to obtain signal amplitude HR of the resonant part. From the dependence of HR on polarization angle φd, the angle φ0d corresponding to HR=0 can be determined. So the Raman depolarization ratio can be obtained from the relationship ρ-1/(tanθtanφ0d), where θ is the polarization angle between Pump beam and Stokes beam. In this report, we introduce another method to process the data from polarized CARS spectrum, namely the method of intersecting point. Compared with the original method, our method needs not any knowledge of frequency distribution of the CARS spectrum, and is simpler.