Refractive index database

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Optical constants of MgF2 (Magnesium fluoride)
Rodríguez-de Marcos et al. 2017: n,k 0.03–2.0 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
deposition_temperature: 250 °C


44 nm film prepared by evaporation from tungsten boat at 250 °C


L. V. Rodríguez-de Marcos, J. I. Larruquert, J. A. Méndez, J. A. Aznárez. Self-consistent optical constants of MgF2, LaF3, and CeF3 films, Opt. Mater. Express 7, 989-1006 (2017) (Numerical data kindly provided by Juan Larruquert)


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Magnesium fluoride, MgF2

Magnesium fluoride (MgF2) is a transparent crystalline material known for its outstanding transmission properties in the ultraviolet to infrared spectrum. It is birefringent and often used in optical components such as windows, lenses, prisms, and polarizers. MgF2 is commonly applied as a protective antireflection coating on optical elements due to its high laser damage threshold, making it especially valuable for applications involving intense ultraviolet light, like those in excimer lasers. Its resistance to mechanical and thermal shocks, coupled with its transparency, also makes it suitable for use in rugged environments and outer space applications.

Other names

  • Magnesium difluoride
  • Magnesium(II) fluoride

External links