BaF2

Barium Fluoride(BaF2) has wide transmission range (200nm-12μm)and low refraction index(1.48) which commonly used in windows,lens and prisms.It is suitable for infrared spectroscopy in the passive IR band between 8 to 14μm,such as IR viewport window for thermographs.

Parameter

Material and Specifications

Property	Value
Chemical formula	BaF₂
Crystal structure	Cubic
Lattice parameters	8.07Å
Density	4.89 g/cm³
Melting Point	1386°C
Refractive Index	n=1.45@5 μm
ThermalConductivity/ (W·cm^-1·K^-1@25°C)	11.72W
Thermal Expansion / (10^-6/°C@120°C)	18.1
Specific Heat/ (J·g^-1·K^-1)	410
Hardness (Mohs)	82
Extinction Ratio	350dB
Orientation	H cut (011)
Poisson Ratio	0.343
Transmission Range	0.15-15µm
Refractive Index	1.45 @5µm
Refractive Loss	7.7% @0.6µm

Specifications Conventional

Property	Value
Materials	BaF₂
Orientation	<001>or<100>,<±0.5°
Parallel	10˝
Perpendicular	10΄
Surface quality	40//20
Wavefront ditortion	λ/4@632nm
Clear aperture	>95%
Chamfer	<0.2×45°
Thickness/Diameter tolerance	±0.1mm
Maximum dimensions	Dia200×50mm
Surface flatness	λ/4@632nm

Specifications High Recision

Property	Value
Materials	BaF₂
Orientation	<001>or<100>, <±0.2°
Parallel	10˝
Perpendicular	5΄
Surface quality	10//20
Wavefront ditortion	λ/8@632nm
Clear aperture	>90%
Chamfer	<0.2×45°
Thickness/Diameter tolerance	±0.1mm
Maximum dimensions	Dia200×50mm
Surface flatness	λ/8@632nm