Refractive index database

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Optical constants of NaF (Sodium fluoride)
Li 1976: n 0.15–17 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



297 K (24 °C).


H. H. Li. Refractive index of alkali halides and its wavelength and temperature derivatives. J. Phys. Chem. Ref. Data 5, 329-528 (1976) and references therein.
* Sellmeier formula is derived by critical analysis of experimental data from several sources.


[Expressions for n]   [CSV - comma separated]   [TXT - tab separated]   [Full database record]


Sodium fluoride, NaF

Sodium fluoride (NaF) is a white crystalline solid that, when purified, can be processed into transparent optical components. With a broad transparency window spanning from the ultraviolet to the mid-infrared regions, NaF is particularly valuable for certain optical applications, especially in deep ultraviolet systems. However, like some other alkali halides, NaF is sensitive to moisture and can be hygroscopic, making it imperative to ensure proper handling and storage to maintain its optical qualities.

Other name

  • Sodium(I) fluoride

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