  We report time resolved studies and measurement of all the components of the
third-order nonlinear optical susceptibility of CS2 at 515 nm using degenerate
four wave mixing. The use of a pulse of width 450 fs, which is comparable to
the time scale of the molecular reorientation dynamics of CS2 makes our study
unique. Given the wide use of this molecule as a reference material, our
results will not only be a useful addition to the data base of the nonlinear
optical properties of CS2, but also provide additional insights into the time
dynamics of the nonlinear processes involved. These results emphasize the
importance of the time scales and wavelengths used to report the nonlinear
optical susceptibility values for the reference material too.
