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ALKOR Technologies - your CRYSTAL optics supplier.
Materials>>BaF2

BARIUM FLUORIDE: BaF2 windows and BaF2 lenses.

Alkor Technologies - manufacturer of BaF2 optical components. We supply BaF2 windows, BaF2 lenses, BaF2 prisms and BaF2 wedges according to customer's specifications. Send RFQ and buy cheaper than major optical catalogs price!

BaF2 windows catalog
BaF2 lenses catalog

BaF2 scintillator grade crystals
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BaF2 windows

BaF2 windows

Barium Fluoride windows, drilled discs, lenses and prisms, can be used in a variety of applications, such as infrared spectroscopy, due to their wide broadband transmission that extend from UV to long-wave infrared.

The transmission range of BaF2 is from 0.2 to 14m. Barium Fluoride's low index of refraction of 1.48 provides high transmission without the need of anti-reflection coatings. BaF2 Transmission in the VUV is degraded by prolonged exposure to moist atmosphere, but it is not significantly degraded by exposure to high energy radiation.

Barium Fluoride is suitable for applications in the IR band (8 to 14 m) and is often used as a IR viewport window for thermography. We provide a large variety of BaF2 windows for vacuum viewports suitable for different flanges.

BaF2 transmission curve

BaF2 transmission curve. Window thickness 10mm.Check another thickness here.

Barium Fluoride is less resistant to attack by water than Calcium Fluoride. Pronounced water attack occurs at 500C, but the material can be used to 800C to dry. Barium Fluoride is the most resistant fluoride to high energy radiation but does not have VUV transmission of other types. The material is relatively hard but is very sensitive to thermal schock.

To calculate minimum thickness of a BaF2 window required for a given pressure, click here.

In addition, scintillation grade BaF2 is usually used as scintillator for gamma detection. It is the fastest scintillating crystals up to now and is used in High Energy Physics Experiments.

Download BaF2 datasheet in PDF.

We have own growth facility for BaF2 crystal growth. We grow and sell about 50kg of BaF2 crystals every month. That is why we can offer Barium Fluoride window and BaF2 optics at very competitive price.

The largest dimensions of BaF2 optics: Dia200x40mm.

High Precision BaF2 windows:

We can provide up to 150mm diameter BaF2 windows with S/D 20/10; Flatness 0.25 waves at 633 and parallelism up to 10 arc. sec.

BaF2 main properties:

Chemical Formula BaF2
Crystal Class Cubic
Molecular Weight 175.36
Lattice Constant, 6.196
Density, g/cm3 (20 C) 4.89
Knoop Hardness, kg/mm2 82
Young's Modulus, GPa 53.05
Shear Modulus, GPa 25.4
Bulk Modulus, GPa 56.4
Apparent Elastic Limit, MPa 26.89
Poisson Ratio 0.343
Dielectric Constant for 2 x 106 Hz 7.33
Melting Temperature, K 1550
Specific Heat, cal/(g K) at 274 K 0.096
Thermal Conductivity, W/(m K) at 286 K 11.7
Thermal Expansion, 1/K at 300 K 19.9 x 10-6
Bandgap, eV 9.1
Solubility, g/100 g H2O 0.17

BaF2 index of refraction

m No m No m No
0.1408 1.8150 0.1452 1.7820 0.1477 1.7670
0.1500 1.6780 0.2000 1.557 0.2652 1.5122
0.2803 1.5066 0.2893 1.5039 0.2967 1.5019
0.3021 1.5004 0.3130 1.4978 0.3254 1.4952
0.3403 1.4925 0.3466 1.4915 0.3610 1.4894
0.3663 1.4887 0.4046 1.4844 0.5461 1.4759
0.5893 1.4744 0.6438 1.4730 0.6563 1.4727
0.7065 1.4718 0.8521 1.4699 0.8944 1.4694
1.0140 1.4685 1.1287 1.4678 1.3673 1.4667
1.5295 1.4661 1.6810 1.4656 1.7012 1.4655
1.9701 1.4647 2.3254 1.4636 2.6738 1.4623
3.2434 1.4602 3.4220 1.4594 5.1380 1.4501
5.5490 1.44732 6.2380 1.4422 6.6331 1.4390
7.0442 1.4353 7.2680 1.4331 9.7240 1.4051
10.346 1.3936