  We review measurements in the literature regarding Kerr nonlinearity of
lithium niobate. Of particular interest is to separate the value of the
electronic Kerr nonlinearity and the strength of the delayed Raman
nonlinearity. The spectral shape of the Raman response in LN is discussed and
we restrict ourselves to the case where the pump is polarized along the optical
axis. This configuration is important for so-called type 0 noncritical
interaction, which is used in QPM devices and in recent supercontinuum
generation and few-cycle soliton compression experiments.
