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The interference between the contributions of two Raman resonances to the third-order susceptibility ^ (3) has been observed in a liquid mixture of benzene and cyclohexane. Utilizing three variable laser frequencies, ^ (3) (-₃, ₀, ₁, -₂) was measured in a parametric mixing experiment as a function of the intermediate frequencies ₀-₂ and ₁-₂ which are near different Raman resonances. Detailed Raman spectra are used to give excellent theoretical fits to the experimental curves. The usefulness of this extension of the well-known three-wave mixing, or CARS (coherent anti-Stokes Raman spectroscopy), experiment in calibrating different two-photon cross sections is discussed.
Lotem et al. (Mon,) studied this question.