BaF₂ (Barium fluoride) optical window for use in FTIR spectroscopy.

• Multi-purpose window for use in UV/VIS and FTIR spectroscopy
• Circular shape
• Large transmission range of 200 nm to 12 μm
• Can be used up to 800 °C in a dry environment
• Resistant to high energy radiation
• Low absorbance coefficient

Low index of refraction and high transmission means no AR coatings needed.

Surface quality: 60/40 scratch dig
Tolerance: Diameter - ±0.1 mm; Thickness - ±0.2 mm
Aperture: 90% (clear aperture)

Melting point: 1360 °C
Parallelism: <3 arc min
Density: 3.18 g/cm³

Young's Modulus: 53 (Gpa)
Knoop Hardness: 82 kg/mm²
Coefficient of Thermal Expansion: 18.1×10⁻⁶/°C