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## Main Question or Discussion Point

I'm wondering about the Kerr Optical effect as described on wikipedia:

http://en.wikipedia.org/wiki/Kerr_effect

Are there limits to the range of parameters at which the effect starts to break down? What λ values and E values does this formula apply to?

http://en.wikipedia.org/wiki/Kerr_effect

Are there limits to the range of parameters at which the effect starts to break down? What λ values and E values does this formula apply to?