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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.
For a typical sample of Polyimide - n=1.89 the refractive index and extinction coefficient at 632.8 nm are 1.88552 and 0.0009496966. Below are files of complete refractive index and extinction coefficients. If the file is not available for download, you can request our proprietary file by clicking "Request".
Refractive Index Reference - Filmetrics Composite
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Proprietary encrypted file for use with Filmetrics Systems: