Refractive index database

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Optical constants of LaF3 (Lanthanum fluoride)
Amotchkina et al, 2020: n 0.4–12 µm, k 9.5–12 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]


Conditions & Spec sheet

n_is_absolute: false
wavelength_is_vacuum: false
substrate: ZnSe
film_thickness: 1.368e-6


1.368 µm LaF3 film deposited on 1 mm thick ZnSe substratee by e-beam evaporation at 120 °C substrate temperature.


T. Amotchkina, M. Trubetskov, D. Hahner, V. Pervak, Characterization of e-beam evaporated Ge, YbF3, ZnS, and LaF3 thin films for laser-oriented coatings, Appl. Opt. 59, A40-A47 (2020) (Data kindly provided by Tatiana Amotchkina [data] [description])


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


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