Zinc Selenide (ZnSe)

Fabricate high-quality lenses, windows, output couplers, beamsplitters, and other optics with ZnSe produced by a leading manufacturer of the material.

ZnSe offers high uniformity and homogeneity for imaging uses and low absorption and scatter for high-power laser applications; its visible light transmission simplifies optical system alignment. ZnSe is also non-hygroscopic and chemically stable.

Zinc Selenide (ZnSe) Characteristics

Coherent routinely supplies ZnSe substrates up to 300 mm, and can provide sheet material, core-drilled blanks, edged blanks, generated curved lens blanks, and more.

ZnSe Material Properties (at 20°C)

Physical Properties


Cubic zincblende


5.27 g/cm³

Grain Size

< 100 μm


None > 0.05 mm

Electrical Density

> 1012 ohm-cm

Optical Properties

Bulk Absorption Coefficient @ 10.6 μm

< 0.0005 cm-1

Thermo-Optic Coefficient (dn/dT) @ 10.6 μm

6.1 x 10-5/°C

Refractive Index Inhomogeneity @ 0.6328 μm

< 3 x 10-6

Thermal Properties

Thermal Conductivity @ 20° C

0.18 W/cm/°C

Specific Heat

0.356 J/g/°C

Linear Expansion Coefficient @ 20° C

7.57 x 10-6/°C

Mechanical Properties

Young’s Modulus

67.2 GPa (9.75 x 106 psi)

Rupture Modulus

55.1 MPa (8,000 psi)

Knoop Hardness

105-120 kg/mm²


5.27 g/cm³

Poisson’s Ratio


Fracture Toughness

0.5 x 106 N/m1.5