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The Kramers Kronig transform is commonly used to relate real and imaginary components of the electric susceptibility- \chi(\omega)

It appears from reading papers that it also works for relating real and imaginary components of the refractive index.

But why? That means that the refractive index can be written as the FT of a response function. What is that response function?

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# Kramers Kronig transforms for refractive index

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