???Polyimide - n=1.64, Polymer - n=1.64
Polyimides are a class of materials composed of imide monomers. The optical properties of polyimides vary widely depending on their composition and synthesis method. DuPont has developed several polyimides which they sell under the trade name Kapton. Many other companies sell polyimides. Due to the drastically different optical properties of various polimides, there are several different material data files, each of which is identified by the refractive index at 632 nm.
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Refractive Index Reference - Filmetrics Composite
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