Refractive index database

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Optical constants of LaF3 (Lanthanum 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


48 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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Lanthanum fluoride, LaF3

Lanthanum fluoride (LaF3) is a white, crystalline, inorganic compound that is used in a variety of optical applications. It is a popular choice for the production of fluoride glass and is also used as a scintillation material in radiation detection. Due to its low refractive index, it is often used in antireflection coatings, especially for infrared optics. The compound is stable, has good thermal durability, and exhibits a wide transparency range, making it a versatile material for various optical systems. Its low solubility in water also makes it preferable in moisture-sensitive applications. LaF3 is an important material in both research and commercial optical technologies.

Other names

  • Lanthanum trifluoride
  • Lanthanum(III) fluoride


  • Fluocerite-(La)

External links