Refractive index database

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Optical constants of SrF2 (Strontium fluoride)
Rodríguez-de Marcos et al. 2013: n,k 0.001582–682.2 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true


Density: 3.98 g/cm3. Film deposited at room temperature.


L. Rodríguez-de Marcos, J. I. Larruquert, J. A. Aznárez, M. Fernández-Perea, R. Soufli, J. A. Méndez, S. L. Baker, E. M. Gullikson. Optical constants of SrF2 thin films in the 25–780-eV spectral range, J. Appl. Phys. 113, 143501 (2013) (Numerical data kindly provided by Juan Larruquert)


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Strontium fluoride, SrF2

Strontium fluoride (SrF2) is an inorganic compound that appears as a white crystalline solid at room temperature. With a high melting point and good thermal stability, it is often used in optical applications due to its notable transparency to ultraviolet and visible wavelengths. Its optical clarity has led to its use in the manufacture of windows and lenses, especially in specialized optical systems. Additionally, SrF2 is employed as a thin film in the production of optical coatings, thanks to its low refractive index. Moreover, the compound is explored for potential use in fluoride ion batteries due to its high ionic conductivity. In nature, strontium fluoride occurs as the mineral strontianite, though most commercial preparations are synthesized through chemical reactions.

Other name

  • Strontium difluoride, Strontium(II) fluoride

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