I want to calculate a third order nonlinear effect such as self focusing and bistability etc.

From the examples, I can get information. However, I can’t find an example for nonlinear susceptibility with losses.

I want to calculate the nonlinear effect of Ag. The nonlinear susceptibility of Ag is 2.5^-8 + i7.2*10^-8.

How can I apply imaginary part of nonlinear susceptibility ?

Thank you