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RefractiveIndex.INFO
RefractiveIndex.INFO provides optical constants and raw data for materials including metals, glasses, and inorganic and organic compounds.
About RefractiveIndex.INFO
RefractiveIndex.INFO is a database of optical constants and raw data for materials, including metals, glasses, and inorganic and organic compounds. Each material page lists refractive index and extinction coefficient values over a wavelength range, along with the references, measurement conditions, and dispersion formulas behind them. The homepage excerpt shows the silicon dioxide (SiO2) page, which gives Malitson 1965 data for 0.21–6.7 µm and notes that the Sellmeier formula is reported for 0.21–3.71 µm, with a second reference verifying it up to 6.7 µm. The example entry is for fused silica at 20 °C.
The site also includes an optical transmission calculator and a Fresnel reflection calculator. The transmission calculator offers several calculation methods, and the reflection calculator reports P-polarized, S-polarized, and non-polarized reflectance. Data can be exported as CSV, TXT, or a full database record. Pricing is not stated, and the excerpt does not show how much material coverage beyond the SiO2 page is available.
Key features
- Refractive index and extinction coefficient data across specified wavelength ranges
- Derived constants including permittivity, absorption coefficient, Abbe number, and group index
- Dispersion formulas listed with reference sources and measurement conditions
- Optical transmission calculator with single-pass, incoherent, and coherent calculation methods
- Fresnel reflection calculator for P-polarized, S-polarized, and non-polarized reflectance
- Reflection phase, Brewster's angle, and critical angle calculations
Best for: Optics researchers and engineers who need refractive index data and dispersion values for specific materials and wavelengths.
Good for
- Each data entry cites its original references and lists the conditions under which data was measured
- Data can be downloaded in CSV, TXT, or full database record formats
- Includes calculators for transmission and Fresnel reflection alongside the data
Watch out for
- Dispersion formulas are valid only over the wavelength ranges stated for each source
- The example entry's data applies to the stated conditions, such as 20 °C for fused silica
- Material coverage beyond the SiO2 example is not shown in the homepage excerpt
RefractiveIndex.INFO at a glance
- Website
- refractiveindex.info
- Category
- Research & Data › Open Data & Datasets
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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RefractiveIndex.INFO FAQ
What wavelength range does the example silicon dioxide data cover?
The Malitson 1965 data covers 0.21–6.7 µm. The Sellmeier formula is reported for 0.21–3.71 µm, and a second reference verifies its validity up to 6.7 µm.
What file formats can the data be exported in?
The site lists CSV, TXT (tab separated), and a full database record as export options, along with expressions for n.
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