Zinc Selenide – ZnSe

lenses, windows, mirrors, filters and prisms

Used for Infrared windows, lenses, mirrors and prisms in the region 0.5 microns to 22 microns, major uses being laser optics and Forward Looking IR systems (FLIR).

Transmission Range 0.5 – 22.0 µ
Crystal Structure Polycrystalline Cubic
Cleavage Plane None
Colour Yellow
Density 5.27
Melting Point (°) 1525
Reflection Loss 29% (10.6µ) for 2 surfaces
Solubility index Insoluble
Hardness (Knoop) 120/50gm indenter
Thermal Conductivity (cal/cm sec°C) 18Wm-1 °K-1 (25°C)
Thermal Expansion coefficient (/°C) 7.57x10-6/°K



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