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Can anyone point me to a source for measurements of the third-order nonlinear electric susceptibilities $\chi^{(3)}$ of various metals? Specifically in relation to the AC Kerr effect, so measurements of the second-order index $n_2$ would do as well.

For example, Bloembergen published measurements in 1969 (Opt. Comm. 1(4), 195) of the $\chi^{(3)}$ of silver and gold determined using THG, but I'd like to know if there's any data for other metals, and whether they are any different when studying the Kerr effect.

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What frequency? (Or DC limit?) –  Steve B Apr 19 '12 at 20:23
Optical frequencies - visible and near infrared (say 500-1000 nm wavelengths.) –  ptomato Apr 20 '12 at 8:49

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There is Structural, linear and third-order nonlinear optical properties of Cu nanocrystal in sodium borosilicate glass

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Cu nanocrystals embedded in glass, though, wouldn't be able to tell much about the solid metal, right? –  ptomato Jun 15 '14 at 0:13

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