PRODUCTS

Zinc Selenide (ZnSe)

Spectroscopic and thermo-mechanical properties

Transmission Range 0.6 to 21.0 μm
Refractive Index 2.4028 at 10.6 μm
Reflection Loss 29.1% at 10.6 μm (2 surfaces)
Absorption Coefficient 0.0005 cm-1 at 10.6 μm
Reststrahlen Peak 45.7 μm
dn/dT +61 x 10-6/°C at 10.6 μm at 298K
dn/dμ = 0 5.5 μm
Density 5.27 g/cm3
Melting Point 1525°C (see notes below)
Thermal Conductivity 18 W m-1 K-1 at 298K
Thermal Expansion 7.1 x 10-6 /°C at 273K
Hardness Knoop 120 with 50g indenter
Specific Heat Capacity 339 J Kg-1 K-1
Dielectric Constant n/a
Youngs Modulus (E) 67.2 GPa
Shear Modulus (G) n/a
Bulk Modulus (K) 40 GPa
Solubility 0.001g/100g water
Molecular Weight 144.33
Class/Structure FCC Cubic, F43m (#216), Zinc Blende structure. (Polycrystalline)

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