UV Material
 Visible Material
 IR Material
 Color Material
 Sperical Material

Barium Fluoride (BaF2)
 
Barium Fluoride can be used in the ultraviolet, visible and infrared spectral regions. Barium Fluoride has transmission above 90% between 0.25 and 9.5µm.
Barium Fluoride is half as hard as Calcium Fluoride and also more susceptible to thermal shock. However, it is commonly used in cryogenically cooled thermal imaging systems. It is somewhat more expensive than Calcium Fluoride and not as readily available in large sizes.
 
Property
Specification
Transmission Range
0.15µm to 12.5µm
Density
4.89 g/cm3
Thermal Expansion
18.1x10-6 /°C @ 20°C+/-100°C
Surface Finish
Polishes of 20-10 scratch-dig are mostly specified for use in UV & visible applications. Typical specifications for surface quality in the infrared are a 40-20 scratch dig in the 0.75 to 3µm spectral region & 60-40 scratch-dig for the 3-7µm area. BaF2 is diamond tunable.
Surface Figure
Surface figure of a 1/10 wave to 1/2 wave @ 0.6328µm are specified mostly on lenses for ultraviolet & visible use. In the infrared, typical required surface figure ranges from 1/2 wave to 2 waves 0.6328µm depending on the system performance requirements.
AR Coating Options
Typical available coatings for BaF2 include BBAR for 0.8 to 2.5µm, 3 to 5µm or the 1 to 5µm spectral regions.
Typical Applications
Cryogenically cooled thermal imaging, Astronomical, Laser applications.
Products Manufactured
Lenses, Aspheric lenses, Windows, Optical Beamsplitters, Optical Filters, Wedges, Prisms.
 
Wavelength (µm)
Index of Refraction (n)
1.700
1.466
2.152
1.464
3.422
1.459
4.000
1.455
6.238
1.442
7.268
1.433
10.346
1.396