I'm new to this forum and this is my first post, so first of all, I'd just like to say hello to you all!
But now, to the matter at hand. I've been researching materials which display nonlinear refractive indices, in particular materials whose refractive index varies depending upon the intensity of light entering them. As far as I know this happens to due to the Kerr effect, but unfortunately I have been unable to find any information on particular materials which exhibit this phenomena.
Any information would be appreciated, I look forward to hearing from you all!