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For a typical sample of Si3N4 the refractive index and extinction coefficient at 632.8 nm are 2.02252 and 0. 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
No guarantee of accuracy - use at your own risk.
Tab-delimited data file for unrestricted use: