Zinc Selenide (ZnSe) is commonly used for CO₂ laser focusing lenses, night vision applications, ATR prisms and transmission windows for IR spectroscopy.

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Optical Properties - Zinc Selenide (ZnSe) Optical Crystals

Transmission Range: 500nm to 22µm
Refractive Index: 2.4 at 10.6µm
Reflection Loss: 29% at 10.6 µm ( 2 surfaces)

Physical Properties - Zinc Selenide (ZnSe) Optical Crystals

Melting Point: 1525° C
Hardness (Knoop): 150 psi
Young's Modulus: 67.2 GPa
Modulus of Rupture: 8000 psi
Structure: Cubic ( typically polycrystalline by chemical vapor deposition)

Chemical Properties-- Zinc Selenide (ZnSe) Optical Crystals

Solubility: Insoluble in water. Soluble in HNO₃. Soluble in strong acids.