PRODUCTS

Calcium Fluoride (CaF2)

Spectroscopic and thermo-mechanical properties

Transmission Range 0.13 to 10 μm
Refractive Index 1.39908 at 5 μm
Reflection Loss 5.4% at 5 μm
Absorption Coefficient 7.8 x 10-4 cm-1 @ 2.7 μm
Reststrahlen Peak 35 μm
dn/dT -10.6 x 10-6/°C at 10.6 μm at 298K
dn/dμ = 0 1.7 μm
Density 3.18 g/cm3
Melting Point 1360°C (see notes below)
Thermal Conductivity 9.71 W m-1 K-1 at 298K
Thermal Expansion 18.85 x 10-6 /°C at 273K
Hardness Knoop 158.3 (100) with 500g indenter
Specific Heat Capacity 854 J Kg-1 K-1
Dielectric Constant 6.76 at 1MHz
Youngs Modulus (E) 75.8 GPa
Shear Modulus (G) 33.77 GPa
Bulk Modulus (K) 82.71 GPa
Solubility 0.0017g/100g water at 20°C
Molecular Weight 78.08
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