User guide

Use these guides to move from material discovery to complete optical calculations.

Materials and catalog	Choose a material model, search the RefractiveIndex.INFO catalog, and preserve provenance.
Custom materials	Import arrays or CSV data, define formula coefficients, validate data, and export YAML.
Interfaces and thin films	Calculate Fresnel coefficients, characteristic angles, and coherent multilayer spectra.
Catalog browser	Search and inspect the downloaded database from an interactive terminal interface.
Physical conventions	Review wavelength, sign, interpolation, power, and provenance conventions.