PRODUCTS

Silicon (Si)

Spectroscopic and thermo-mechanical properties

Transmission Range 1.2 to 15 μm
Refractive Index 3.4223 @ 5 μm
Reflection Loss 46.2% at 5 μm
Absorption Coefficient 0.01 cm-1 at 3 μm
Reststrahlen Peak n/a
dn/dT 160 x 10-6/°C
dn/dμ = 0 10.4 μm
Density 2.33 g/cm3
Melting Point 1420 °C
Thermal Conductivity 163.3 W m-1 K-1 at 273K
Thermal Expansion 2.6 x 10-6 / at 20°C
Hardness Knoop 1150
Specific Heat Capacity 703 J Kg Kg-1 K-1
Dielectric Constant 13 at 10 GHz
Youngs Modulus (E) 131 GPa
Shear Modulus (G) 79.9 GPa
Bulk Modulus (K) 102 GPa
Solubility Insoluble in Water
Molecular Weight 28.09
Class/Structure Cubic diamond, Fd3m

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