Two grades of ZnS are available for use in imaging systems and instruments. Regular grade material is grown by the chemical vapour deposition process. This material is often used in the 3 to 5μm and 8 to 12μm region. Its high resistance to rain erosion and high-speed dust and particulate abrasion makes it particularly suitable for exterior IR windows on aircraft frames.
MultiSpectral grade ZnS is treated after growth to eliminate microscopic voids and defects which occur in the Regular grade, thus extending the usefulness of this material to include the visible region. This material is particularly well suited for high-performance common aperture systems that must perform across a broad wavelength spectrum.
Hot-pressed Polycrystalline Zinc Sulphide(HP ZnS) have good infrared transmission and thermal property and high impact overloading resistance and has been extensively used in the infrared detector windows with various sizes.
ZnS has a lower cost relative to ZnSe and ZnS MS, and has potential wherever a tough and strong IR transmitting material is required.
Ø ZnS Lenses
Ø ZnS Prisms
Ø ZnS Windows
Ø ZnS Domes
Ø ZnS Mirrors
Ø ZnS Wedge
Ø Customs Optics
Ø Clear Aperture: 90%
Ø Dimensional Tolerance:+0.0/-0.1mm
Ø Thickness Tolerance: ±0.1mm
Ø Surface Quality :10/5
Ø Surface Accuracy: 1/10λ@10.6μm
Ø Parallelism:<1 acr minute
Ø Coating: 3-12μm AR,<5% per surface
8-12μm AR,<2% per surface