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Barium Fluoride (BaF2)

Spectroscopic and thermo-mechanical properties

Transmission Range 0.15 to 12 μm
Refractive Index 1.45 at 5 μm
Reflection Loss 6.5% at 5 μm (2 surfaces)
Absorption Coefficient 3.2 x 10-4 cm-1 @ 6 μm
Reststrahlen Peak 47 μm
dn/dT -15.2 x 10-6/°C
dn/dμ = 0 1.95 μm
Density 4.89 g/cm3
Melting Point 1386°C (see notes below)
Thermal Conductivity 11.72 W m-1 K-1 at 298K
Thermal Expansion 18.1 x 10-6 /°C at 273K
Hardness Knoop 82 with 500g indenter
Specific Heat Capacity 410 J Kg-1 K-1
Dielectric Constant 7.33 at 1 MHz
Youngs Modulus (E) 53.07 GPa
Shear Modulus (G) 25.4 GPa
Bulk Modulus (K) 56.4 GPa
Solubility 0.17g/100g water at 23°C
Molecular Weight 175.36
Class/Structure Cubic Fm3m (#225) Fluorite structure. Cleaves on (111)

Standard specifications

Orientation ---
Clear aperture >90%
Face dimensions tolerance +0/-0,1 mm
Length tolerance ±0,1 mm
Parallelism error <10 arcsec
Perpendicularity error <10 arcmin
Protective chamfers <0,1 mm at 45˚
Surface quality 40-20 S-D
Surface flatness <λ/8@632,8 nm
Wavefront distortion λ/4@632,8 nm
Coatings Custom
Laser induced damage threshold ---
Mount Unmounted