An optical four-wave mixing (FWM) described by the nonlinear susceptibility x
(3) (ω
as = 2ω
p − ω
s) is studied in a single crystal of Rochelle salt (NaKC4H4O6·H2O). In addition to the coherent anti-Stokes Raman Scattering (CARS) structure, the FWM spectra consist of nonvibrational (background) components. After analysis of the FWM spectra in the range from 1100 to 1450 cm−1, the nonresonant (electronic) susceptibility elements x
el
zzzz
and x
el
xxxx
of Rochelle salt single crystal are estimated.
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