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Effects of polarization beating on femtosecond coherent anti-Stokes Raman scattering spectroscopy of
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View: Figures


Image of FIG. 1.
FIG. 1.

Raman excitation diagram of and CO with 80 fs pump and Stokes pulses. In the ground electronic state, 2330 and correspond to the excitation of to transitions of and CO, respectively.

Image of FIG. 2.
FIG. 2.

Time-resolved femtosecond CARS signal for pure and for a mixture of 25% CO and 75% at various temperatures. The symbols represent experimental data points and the solid lines correspond to the best-fit results obtained by fitting the experimental data points with the data calculated from the theoretical model described in Ref. 2.

Image of FIG. 3.
FIG. 3.

Time-resolved femtosecond CARS signal for mixtures of and CO, showing the vibrational beat frequency between the two CARS polarization. The decay rate of the CARS signals is unchanged as the concentration of CO is varied.

Image of FIG. 4.
FIG. 4.

Modulation depth of the beat frequency between and CO as a function of CO concentration in . The pump and Stokes laser wavelengths were centered at and , respectively.

Image of FIG. 5.
FIG. 5.

Time-resolved femtosecond CARS signal in an atmospheric-pressure -air flame for an equivalence ratio of 1.2.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of N2–CO polarization beating on femtosecond coherent anti-Stokes Raman scattering spectroscopy of N2