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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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