For a typical sample of Polycrystalline Silicon the refractive index and extinction coefficient at 632.8 nm are 3.92945 and 0.07175439. 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.