Zinc Sulphide (ZnS) is a widely used IR transmitting material in windows, lenses and prisms. The material transmits at about 50% between 0.4 -12μm before dropping off to zero transmission around 15μm. Its low absorbance in the IR spectrum makes it desirable for CO2 lasers operating at 10.6μm. Zinc Sulphide has a pale yellow to clear appearance and a hardness of HK160. Although the material is resistant to thermal shock, it is not recommended for harsh environments.
ZnSe Right Angle Prism can be used to bend a beam by 90deg or 180deg, depending on which face is entrance face.
Material | CVD Zinc Selenide |
Diameter Tolerance | +0.0/-0.1 mm |
Thickness Tolerance | ±0.1 mm |
Surface Quality | 40/20 Scratch-Dig |
Surface Flatness (Plano Side) | λ/2 at 633nm |
Surface Irregularity (Peak to Valley) | λ/4 at 633nm |
Angle tolerance | 3 arcmin (5 seconds according to customer requirements) |
Chemical Formula | ZnSe |
Molecular Weight | 144.33 |
Crystal Class | Cubic, hexagonal |
Crystal Structure | Polycrystalline |
Density, g/cm3 at 293 K | 5.27 |
Melting Temperature, K | 1790 |
Thermal Conductivity, W/(m K) at 300 K | 18 |
Thermal Expansion, 1/K | |
at 173 K | 5.6 x 10-6 |
at 273 K | 7.1 x 10-6 |
at 473 K | 8.3 x 10-6 |
Specific Heat, cal/(g K) at 296 K | 0.081 |
Debye Temperature, K | 246 |
Bandgap, eV | 2.7 |
Solubility in water at 298 K | 0.001 g/100 g H2O |
Knoop Hardness, kg/mm2(100 g load) | 105 |
Young's Modulus, GPa | 70 |
Bulk Modulus, GPa | 40 |
Poisson's Ratio | 0.28 |