ZnSe : Ideal for Thermal Imaging and FLIR

Zinc Selenide（ZnSe）optics are ideal for a wide variety of infrared applications including thermal imaging, FLIR, and medical systems. This chemically vapor desposited material is widely used in high power CO2 laser systems because of its low absorption coefficient and high resistance to thermal shock.

We manufactures ZnSe products to exacting standards. By employing the minimum-damage polishing technology and the highest quality optical thin-film coatings, we carefully control ZnSe bulk absorption and internal defect structure for high-power applications.

Zinc Selenide (ZnSe) is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it’s critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing technology be employed, and the highest quality optical thin-film coatings are used.

ZnSe is a relatively soft material that scratches easily and it is not recommended in harsh environments because its Knoop Hardness is only 120.

ZnSe is non-hygroscopic and chemically stable, unless treated with strong acids. It’s safe to use in most industrial, field, and laboratory environments. Since it is a toxic material, processing and handling are subject to strict procedures.

OPTICAL PROPERTIES                                                                    STANDARD

         Bulk Absorption Coefficient @ 10.6μm                                       ≤0.0005 cm-1

         Temperature Change of Refractive Index @ 10.6μm                    61 x 10-5 K-1

THERMAL PROPERTIES

         Thermal Conductivity                                                                 0.18 W m-1 K-1

         Specific Heat                                                                             0.356 J kg-1 K-1

         Linear Expansion Coefficient @ 20°C                                          7.57 x 10-5 K-1

MECHANICAL PROPERTIES

         Young's Modulus                                                                       67.2 GPa

         Rupture Modulus                                                                       55 GPa

         Knoop Hardness                                                                        105-120 kgf mm-2

         Density                                                                                     5270 kg m-2

         Poisson's Ratio                                                                          0.28

Ø Size from 2mm to 300mm

Ø  Dimension Tolerance: +/-0.01mm

Ø  Angular accuracy: +/-2 arcsec

Ø  Surface quality: 10-5 S/D

Ø  Flatness: l/10@633nm

Ø  Radius: from +/-2mm to +/-3000m

Ø  Centre error: 30 arcsec