New treatment of CARS spectrum to determine the Raman depolarization ratio

作者：Yu Yuan Qin; Lin Ke; Yu Feng; Zhou Xiao Guo; Liu Shi Lin^*; Ma Xing Xiao

来源：Acta Physica Sinica, 2007, 56(5): 2699-2703.

• CARS
• Raman depolarization ratio

The Raman depolarization ratio rho 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 phi(d), and simulated by a Lorentz bandshape to obtain signal amplitude H-R of the resonant part. From the dependence of H-R on polarization angle phi(d), the angle phi(0)(d) corresponding to H-R = 0 can be determined. So the Raman d R = 0 depolarization ratio can be obtained from the relationship rho = -1/(tan theta tan phi(0)(d)) where is the polarization angle between theta 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.

• 出版日期2007-5
• 单位中国科学技术大学