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Infrared Optics
BaF2 Crystal
CaF2 Crystal
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BaF2 (Barium Fluoride) Crystal

BaF2 is relatively hard but is highly sensitive to thermal shock. For its transmission range is 0.2 m - 11 m, the material is widely used for making optical windows, lenses and prisms in UV-IR spectra. Besides it can also be used as substrate for some applications. BaF2 is less resistant to attack by water than CaF2. Pronounced water attack occurs at 500 C, but in a dry environment the material can be used up to 800 C. BaF2 is grown by modified Bridgman technique. Maximum available size: Dia 200 mm x Thickness 50 mm. In addition, BaF2 is usually used as scintillator for gamma detection. It is the fastest scintillating crystals up to now.

Main Specifications:

Maximum Size Single Crystal: 100100 mm
Poly Crystal: 200100 mm (3 ~7 boundaries)
Dimension Tolerance 0.1mm
Flatness Tolerance ~ /10 at 632.8 nm over central 90% of edge dimensional
Parallelism 1 arc sec ~ 3 arc min
Surface Quality (Scratch/Dig) 10/5

Physical and Optical Properties:

Transmission Range (mm)
0.15 ~12.5
Refractive Index (within 0.26~12.00 mm)
1.5122~1.3703
Reflection Loss at 10.35 mm 5.3% (2 surfaces)
Absorption Coefficient at 6mm (cm-1) 3.210-4
Density (g/cm3) 4.89
Melting Point (C) <1280
Thermal Conductivity at 286K (Wm-1K-1) 11.72
Thermal Expansion at 273K (K-1) 18.110-6
Knoop Hardness 82 with 500g indenter
Specific Heat (J Kgm-1K-1) 410
Dielectric Constant at 1MHz 7.33
Elastic Coefficients C11 = 89.2 C12 = 40.0 C44 = 25.4
Apparent Elastic Limit (Mpa) 26.9 (3900psi)
Possion Ratio 0.343
Solubility in 100g water at 23C (g) 0.17
Cleavage (111)

Transmission Spectrum: (thickness of 10mm)

 

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