We demonstrate a method for determining the phase of the third-order susceptibility, chi ((3)), in the proximity of a Raman resonance. The measurements were based on the phenomenon of polarization beats, which was exploited in a time-delayed four-wave-mixing experiment with bichromatic beams. The phase dispersion of chi((3)) was studied close to resonance with the 655.7-cm(-1) vibrational mode of carbon disulfide.
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Ma et al. (1992) studied this question.
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