Hello,

I'd like to understand what complex refractive indices can be found in nature. Specifically I am trying to get an order of magnitude estimation on the imaginary part of the refractive index. In what type of active lasing medium would this be the largest ? and how large would it actually get ? 10^-4 ? 0.01 ? 0.1 ? 

It sounds like a simple question, but I had a surprisingly hard time getting a simple answer from the literature.

Can anyone help ? 

Hanan

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