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We review measurements in the literature regarding Kerr nonlinearity oflithium niobate. Of particular interest is to separate the value of theelectronic Kerr nonlinearity and the strength of the delayed Ramannonlinearity. The spectral shape of the Raman response in LN is discussed andwe restrict ourselves to the case where the pump is polarized along the opticalaxis. This configuration is important for so-called type 0 noncriticalinteraction, which is used in QPM devices and in recent supercontinuumgeneration and few-cycle soliton compression experiments.

Review of measurements of Kerr nonlinearities in lithium niobate: the role of the delayed Raman response