CaF2 Windows

Calcium Fluoride crystal shows good optical andthermo-mechanical properties, can be used for optical windows, lenses, prismswithin a wide range from 130nm to 9μm. It has optical properties of isotropy,low absorption and low refractive index, which made CaF2 gain the uniqueadvantages in the application of high power lasers.
Antyco is able to offer
CaF2 IR viewport Windows for Infrared Thermography at 8μmto 10μm
Various optics for IR & VUV application, using ourCaF2 crystal materials
Good quality CaF2 crystal blank materials
OEM service for good quality CaF2 crystals

Optical Properties

Transmission Range

130 nm to 10 μm


>94% at 193 nm to 7.8 μm

Refractive Index

1.39908 at 5 μm

Reflection Loss

5.4% at 5 μm (both surfaces)

Absorption Coefficient

0.03cm-1 at 2.6 μm to 2.9 μm


-10.6 x 10-6 /°C

Physical Properties


3.18 g/cm3

Melting Point


Thermal Conductivity

9.71 Wm-1K-1 at 286K

Thermal Expansion

18.85 x 10-6 /°C at 273K

Knoop Hardness

158.3 with 100g indenter (kg/mm2)

Specific Heat Capacity

854 J/(kg.k)

Dielectric Constant

6.76 at 1MHz

Youngs Modulus (E)

75.80 GPa

Shear Modulus (G)

33.77 GPa

Bulk Modulus (K)

82.71 GPa

Elastic Coefficient

C11=164; C12=53; C44=33.7

Apparent Elastic Limit

36.54 MPa (3900 psi)

Poisson Ratio


Chemical Properties


0.0017 g/ 100g water at 20°C

Molecular Weight



Cubic Crystal

Cleavage Plane



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