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Years ago I stumbled upon something related: it was a piece of transparent polymer or polycarbonate that would glow when exposed to infrared light.

I tried to find it again repeatedly, but never managed to find it. Anyone knows this?

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Do you mean something like this http://www.bromba.com/indicard/indicare.htm? I remember that we used this in experiments with IR lasers to ensure that the beam was where we expected it to be.

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