Barium Fluoride BaF2 Crystal and Substrates

  • €6995

Barium fluoride, BaF2, crystal has good transmittance over a wide spectrum range, from 150 nm to 12.5 um. It has been widely used as windows, lenses, and prisms, particularly for ultaviolet transmittance. The highest quality BaF2 has been used for scintillation crystals. BaF2 can also be used a crystal substrates for the epitaxial growth of thin films. 

MSE Supplies offers the following choices:

  • Customized crystal growth and machining
  • High quality blank BaF2 crystal materials in discs, plates, rods, customized for customers
  • Crystal orientations: (100), (111) or other custom-made orientations
  • Standard BaF2 substrate sizes: 10 mm x 10 mm x 1.0 mm, 1 inch diameter x 1.0 mm
  • Surface polishing: Single Side Polished (SSP) or Double Side Polished (DSP)
  • High quality BaF2 scintillation crystal
  • Customized BaF2 optics for IR and VUV applications
  • BaF2 viewport windows for Infrared thermography from 8 um to 14 um.


  • Maximum diameter: 7 inches (180 mm)
  • Surface quality: S/D 20/10 for optical windows or other optical components, Ra < 20 A for epi-ready crystal substrates

Optical Properties

Transmission Range

150 nm to 14 um


>94% at 350 nm to 10.8 um

Refractive Index

1.4624 at 2.58 um

1.3936 at 10.35 um

Reflection Loss

6.8% at 2.58 um (both surfaces)

5.3% at 10.35 um (both surfaces)

Radiation Length

20.6 mm

Residual Radiation Peak

47 nm

Emission Peak

310 nm slow; 220 nm fast

Decay Constant

620 ns slow; 0.6 ns fast

Light Output

20% slow; 4% fast

Absorption Coefficient

3.2 x 10^-4 cm-1 at 6 um

Physical Properties


4.89 g/cm3

Melting Point

1280 °C

Thermal Conductivity

11.72 W.m-1K-1 at 286K

Thermal Expansion Coefficient (CTE)

18.1 x 10-6 /C at 273K

Knoop Hardness

82 with 500g indenter (kg/mm2)

Specific Heat Capacity

410 J/(kg.K)

Dielectric Constant

7.33 at 1 MHz

Young's Modulus (E)

53.07 GPa

Shear Modulus (G)

25.4 GPa

Bulk Modulus (K)

56.4 GPa

Apparent Elastic Limit

26.9 MPa (3900 psi)

Poisson Ratio


Chemical Properties


0.0017 g in 100g water at 23°C

Molecular Weight

175.36 g/mole


Cubic Crystal

Cleavage Plane