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For a typical sample of Si3N4-thin the refractive index and extinction coefficient at 632.8 nm are 2.00196 and 0.0001. 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 - Various sources
No guarantee of accuracy - use at your own risk.
Proprietary encrypted file for use with Filmetrics Systems: