UV Material
 Visible Material
 IR Material
 Color Material
 Sperical Material

Zinc Sulfide (ZnS)
 
Zinc Sulfide (ZnS), Regular Grade. A Chemically Vapor Deposited (CVD) material, ZnS (regular) has good imaging quality over the 8-12µm band. It also transmits in the 3-5µm band, but with higher absorption and scatter. The material exhibits high strength and hardness, and good resistance to hostile environments. The ZnS regular is 50% harder than ZnS, multi-spectral grade and twice and hard as ZnSe. ZnS regular does not transmit well in the visible spectral region. It has the relatively low cost of about 2/3 the price of ZnS, multi-spectral grade or ZnSe. Zinc Sulfide is mainly used for windows and lenses in the 8µm to 12µm range. The reflective index is near 2.2. Zinc Sulfide is particularly strong and can be used for infrared windows in high speed aircraft and vacuum applications.
 
Property
Specification
Transmission Range
3µm to 12µm
Density
4.09 g/cm3
Thermal Expansion
6.6 x 10-6 /°K @ 273°K, 7.3 x 10-6/°K @ 173°K
Surface Finish
Typical specifications for surface quality in the 3-12µm spectral region are 60-40, 80-50 or 120-80 scratch-dig depending upon system performance requirements. ZnS regular is diamond turnable.
Surface Figure
In the infrared, typical surface figure ranges from 1/2 wave to 2 waves @ 0.6328µm depending on the system performance requirements.
AR Coating Options
Typical available coatings for ZnS include BBAR for the 3 to 5µm & the 8 to 12µm regions. Many other specialized wavelength bands are possible within the 3 to 12µm spectral range.
Typical Applications
Thermal imaging, FLIR
Products Manufactured
Lenses, Aspheric lenses, Windows, Domes, Wedges.
 
Wavelength (µm)
Index of Refraction (n)
1.0
2.292
3.0
2.257
5.0
2.246
7.0
2.232
9.0
2.212
11.0
2.186
13.0
2.152
15.0
2.106
17.0
2.045