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BARIUM FLUORIDE (BaF2) windows

Alkor Technologies - Russian manufacturer of BaF2 optical components. We supply BaF2 windows, BaF2 prisms, BaF2 lenses according to customer's specifications. Please visit our new BaF2 windows catalog.

Standard Specifications
Material Barium Fluoride
Dimensions ± 0.00/-0.10mm
Thickness ± 0.10mm
Surfaces 60/40
Edges Fine Ground
Flatness ≤5 Fringes
Parallelism ≤ 3 Arc mins

We have own growth facility for BaF2 and CaF2 crystal growth. That is why we can offer Barium Fluoride window and BaF2 optics at very competitive price.

The largest dimensions of BaF2 optics: Dia220x40mm. Please send us your specifications, we will quote it for you within 24 hrs.

!!! Sale!!!

# Item Specifications Price
1 BaF2 window Diameter 25.0 (+0/-0.1)mm; thickness 4.0 (+/-0.1)mm; S/D: 60/40. Qty: >100pcs. Delivery: 1 week Ask for quote

BaF2 transmission

BaF2 transmittance. Window thickness 10mm.

Barium Fluoride is used for windows, lenses and prisms, particulary when transmission into the ultraviolet is desired. The transmission range of BaF2 is from 0.2 to 11mkm. Transmission in the VUV is degraded by prolonged exposure to moist atmospher, but it is not significantly degraded by exposure to high energy radiation.

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. Barium Fluoride is suitable for applications in the IR band (8 to 14 microns) and is often used as a viewport window for thermography. To calculate minimum thickness of a BaF2 window required for a given pressure, click here. In addition, BaF2 is usually used as scintillator for gamma detection. It is the fastest scintillating crystals up to now.

BaF2 main properties:

Chemical Formula BaF2
Crystal Class Cubic
Molecular Weight 175.36
Lattice Constant, Å 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 refractive Index

Wavelength, µm 0.26 0.30 0.36 0.48 0.85 3.24 5.14 6.50 8.00 8.60 9.20 9.80
Refractive Index 1.51 1.50 1.49 1.48 1.47 1.46 1.45 1.44 1.43 1.42 1.41 1.40
 
Tel: +7(812)3631240 Fax: +7(812)3631239 Email: technologies@alkor.net