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Barium fluoride crystal shows good optical transmission over wide spectrum range, from 150nm to 12.5aam. - details see: https://www.machineto.com/barium-fluoride-crystal-glass-windows-baf2-10215288

BaF₂

Barium fluoride crystal shows good optical transmission over wide spectrum range, from 150nm to 12.5μm. It is used for windows, lenses and prisms, particularly for the application of ultraviolet transmission. The highest quality of BaF₂has an application as the well know scintillation crystal.

Scitlion is able to offer

l BaF₂IR Viewport Windows for Infrared Thermography at 8μm to 14μm

l Various optics for IR & VUV application, using our BaF₂crystal materials

l Good quality BaF₂scintillation crystal

l Good quality BaF₂crystal blank materials

l OEM service for good quality BaF₂crystals

Capabilities

l Maximum of Material Diameter: dia180mm

l Clear Aperture: 85%

l Surface Flatness: λ/4 at 633nm

l Surface Quality: 20/10

BaF₂Crystal Properties

Optical Properties
TransmissionRange	150 nm to 14 μm
Transmittance	>94% at 350 nm to 10.8 μm
Refractive Index	1.4624 at 2.58 μm 1.3936 at 10.35 μm
Reflection Loss	6.8% at 2.58 μm (both surfaces) 5.3% at 10.35 μm (both surfaces)
Radiation Length	20.6 mm
ResidualRadiation Peak	47 nm
EmissionPeak	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 10-4cm-1at 6 μm
dn/dT	-15.2 x 10-6/°C
Physical Properties
Density	4.89 g/cm3
Melting Point	1280°C
Thermal Conductivity	11.72 Wm-1K-1at 286K
Thermal Expansion	18.1 x 10-6/°Cat 273K
Knoop Hardness	82 with 500g indenter (kg/mm2)
Specific Heat Capacity	410J/(kg.k)
Dielectric Constant	7.33 at 1MHz
Youngs Modulus (E)	53.07 GPa
Shear Modulus (G)	25.4 GPa
Bulk Modulus (K)	56.4 GPa
Elastic Coefficient	C11=89.2; C12=40.0; C44=25.4
Apparent Elastic Limit	26.9 MPa (3900 psi)
Poisson Ratio	0.343
Chemical Properties
Solubility	0.0017 g/ 100g water at 23°C
Molecular Weight	175.36
Structure	Cubic Crystal
Cleavage Plane	(111)