We have used the second harmonic of a Nd: glass laser and a continuously tunable dye laser to measure the variation of the third-order nonlinear susceptibility |χ⁽³⁾(-2ω₁+ω₂, ω₁, ω₁, -ω₂)|² when ω₁-ω₂ passes through the optical-phonon resonance in diamond. The frequency difference between the observed maximum and minimum determines the nonlinear electronic susceptibility χ(3)E both in sign and magnitude with respect to the Raman susceptibility. A theoretical discussion of this interference is presented.
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Levenson et al. (1972) studied this question.
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