ALKOR Technologies - your CRYSTAL optics supplier.   ALKOR Technologies - your CRYSTAL optics supplier.
ALKOR Technologies - your CRYSTAL optics supplier.
Materials>>CaF2 windows

Calcium Fluoride (CaF2) windows and CaF2 lenses

Alkor Technologies - manufacturer of custom Calcium Fluoride optical components for Ultraviolet and Infrared applications.

Please visit our CaF2 windows catalog and CaF2 lenses catalog and buy cheaper than major optical catalogs price!

We produce the following custom CaF2 optics:

  • CaF2 lenses with any focal length;
  • CaF2 windows up to 220mm diameter;
  • CaF2 wedges, prisms and CaF2 mirrors;
  • Excimer CaF2 optics, CaF2 monocrystals, Raman grade CaF2 optics and etc.

Please send us your specifications, we will quote it within 24hrs.

CaF2 IR window

We have own growth facility for CaF2 crystal growth. We grow about 50kg of CaF2 crystals every month. That is why we can offer high quality Calcium Fluoride (CaF2) windows and lenses at very competitive price. Compare our prices now!

Simple guide to CaF2 grade: Excimer, VUV, UV, IR. Click here.

CaF2 transmission curve

CaF2 transmission curve. Sample thickness 10mm.

Calcium Fluoride is used for optical windows, drilled discs, lenses and prisms in transmision range 0.15-9m. Degradation due to to moisture in the atmosphere is minimal, and polished surfaces of the CaF2 windows may be expected to withstand several years exposure to normal atmospheric conditions.

Since they are nonaxial, CaF2 crystals do not require consideration of axial direction. Because of CaF2 low refractive index, Calcium Fluoride windows can be used without an anti-reflection coating.

Calcium Fluoride is attacked by atmospheric moisture at 600C, where it begins to soften. The top use temperature is 800C, when moisture is not present. Irradiation of Calcium Fluoride windows causes some loss in UV transmission. CaF2 is sensitive to thermal shock.

Typical applications: VUV - UV - IR imaging systems, excimer laser windows, CaF2 viewport, Spectroscopic windows and lenses. Alkor produces CaF2 windows and mirrors for European manufacturers of gas detectors and gas analyzers.

Maximum diameter of CaF2 windows by Alkor - 220mm (8"). Alkor manufactures vacuum UV grade CaF2 windows and lenses (193nm and 157nm) upon request.

Download CaF2 datasheet in PDF.

Chemical Formula CaF2
Crystal Class Cubic, cleaves [111] plane
Lattice Constant, 5.46
Density, g/cm3 (20 C) 3.18
Molecular Weight 78.08
Dielectric Constant for 105 Hz 6.76
Melting Temperature, K 1630
Thermal Conductivity, W/(m K) at 273 K 10
Thermal Expansion, 1/K at 300 K 18.9 x 10-6
Specific Heat, cal/(g K) at 273 K 0.204
Debye Temperature, K 510
Young's Modulus, GPa 75.79
Rupture Modulus, GPa 0.0365
Shear Modulus, GPa 33.76
Bulk Modulus, GPa 83.03
Poisson's Ratio 0.28
Knoop Hardness, kg/mm2 178 [100], 160 [110]

m No m No m No
0.149 1.5800 0.161 1.5490 0.195 1.5000
0.200 1.4950 0.222 1.4800 0.248 1.4680
0.266 1.4621 0.280 1.4584 0.300 1.454
0.337 1.4481 0.400 1.4419 0.486 1.4370
0.588 1.4339 0.656 1.4325 0.687 1.4320
0.728 1.4314 0.884 1.4298 1.014 1.4288
1.100 1.4283 1.250 1.4275 1.650 1.4256
1.900 1.4244 2.058 1.4236 2.450 1.4214
2.700 1.4199 2.800 1.4192 3.050 1.4175
3.400 1.4149 4.000 1.4096 4.400 1.4057
4.800 1.4014 5.000 1.3991 5.304 1.3952
5.893 1.3871 6.483 1.3782 7.072 1.3681
7.661 1.357 8.251 1.3444 8.840 1.3308
9.429 1.3161