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< Tech. doc. < properties and transmission of optical materials


PROPERTIES of Zinc Selenide (ZnSe)


MECHANICAL PROPERTIES
Young Modulus : 67.2 GPa
Bulk Modulus : 40 GPa
Knoop Hardness : 1.03 GPa
Modulus of Rupture : 55.1 MPa
Poisson's Ratio : 0.28
Density : 5.27 g/cm3


THERMAL PROPERTIES
Melting Point : 1525°C
Max operating temperature (with coating) : 100°C
Specific Heat : 0.081 cal/(g·°C) @ 23°C
Thermal Expansion Coefficient : 5,6x10-6 °C-1 a -100°C
: 7,1x10-6 °C-1 a 0°C
: 8,3x10-6 °C-1 a 200°C


THERMAL PROPERTIES
Thermal Conductivity : 18 W/(m·°C) @ 20°C


ELECTRICAL PROPERTIES

Dielectric Constant for 106Hz : 6.76


OPTICAL PROPERTIES


Transmission Range : 0.6...21μm
Transmittance (without coating) : 68% (2.5...12.5μm)
Refractive Index : 2.5914 a 0,6328μm
  : 2.4865 @ 1,063μm
  : 2.4508 @ 2,500μm
  : 2.4015 @ 10,6μm
Damage Threshold : 5 x 104 W/cm2




Transmission Curve (with coating from 7.5 to 14μm)