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Barium Fluoride (BaF2) Windows

  • Maximum diameter 200mm
  • Transmitting range 0.2μm to 11.0μm
  • Excellent as IR windows for switch gear
Curves All Inquire Us  

Specifications:

Materials IR grade Barium fluoride crystals Diameter Range ~ 200mm
Aperture >90% Dimension Tolerance +0.0/-0.1mm
Thickness Tolerance +/-0.2mm Surface Quality 60/40 S/D
Parallelism 1 arc minute Chamfer 0.3-0.5mmx45degree
Coating Optional protective coating
 

Physical and Optical Properties:

Transmission Range 0.15 to 12 μm Refractive Index 1.45 at 5 μm (1)
Reflection Loss 6.5% at 5 μm (2 surfaces) Absorption Coefficient 3.2 x 10-4cm-1 @ 6 μm
Reststrahlen Peak 47 μm dn/dT -15.2 x 10-6 °C (2)
dn/dμ = 0 1.95 μm Density 4.89 g/cc
Melting Point 1386°C Thermal Conductivity 11.72 W m-1 K-1 @ 286 K
Thermal Expansion 18.1 x 10-6 /°C @ 273 K Hardness Knoop 82 with 500g indenter (4)
Specific Heat Capacity 410 J Kg-1 K-1 (3) Dielectric Constant 7.33 at 1 MHz
Youngs Modulus (E) 53.07 GPa (3) Shear Modulus (G) 25.4 GPa (3)
Bulk Modulus (K) 56.4 GPa Elastic Coefficients C11 = 89.2 C12 = 40.0 C44 = 25.4 (2)
Apparent Elastic Limit 26.9 MPa (300psi) (4) Poisson Ratio 0.343
Solubility 0.17g/100g water at 23°C Molecular Weight 175.36
Class/Structure Cubic CaF2, Fm3m, (111) , cleavage

Barium Fluoride is often suitable for applications in the passive IR band (8 to 14 μm) and is often used as a viewport window for thermal imaging inspection application in electric power facilities and petroleum industries. For an equivalent thickness the transmission extends approximately 1 micron further into the IR than Calcium Fluoride.

Hangzhou Shalom EO also provided the BaF2 windows with the protective coatings and assembly windows with metal holders.

Curves:
Transmission curve of the BaF2 windows of different thickness