Zinc Sulphide (CVD-ZnS)
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Zinc Sulphide is produced by synthesis from zinc vapour and H2S gas (chemical vapor desposition (CVD) process), forming as sheets on graphite substrates.
CVD-ZnS exhibits exceptional fracture strength, hardness and chemical inactivity leading to its frequent choice for military applications or other harsh environments.
Tydex produces optical componenst from both CVD-ZnS grades - IR grade (IR-ZnS) and multicspectral (water-clear) grade (MS-ZnS).
IR-ZnS is often used in the 8 to 12 microns region. Its high resistance to rain erosion and high-speed dust and particulate abrasion makes it particularly suitable for exterior IR windows for varios demanding applications.
MS-ZnS is treated by a hot isostatic press (HIP) process. Under intense heat and pressure, defects within the crystalline lattice are virtually eliminated, leaving a water-clear material with minimal scatter and high transmission characteristics from 0.4 to 12 microns.
Physical and Chemical Properties of ZnS
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Optical Properties
| Parameter | IR-ZnS | MS-ZnS | |
| Thermo-optic Coefficient, (dn/dT)@298 K, 1/K |
@0.633 μm | 6.4 x 10-5 | 5.4 x 10-5 |
| @1,15 μm | 4.2 x 10-5 | 5.0 x 10-5 | |
| @3,39 μm | 4.6 x 10-5 | 4.6 x 10-5 | |
| @10,6 μm | 6.6 x 10-5 | 4.6 x 10-5 | |
| Reflection loss @ 10.6 μm (2 surfaces), % | 24.7 | ||
| Index of Reflection Homogeneity (dn/n)@0.633 μm | 5.0 x 10-5 | ||
Refractive Index
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Fig. 1. Transmission spectra of CVD - ZnS windows of both grades.
Thicknesses are specified in mm.
Tydex offers optics from CVD-ZnS with the following limations in overal dimentions:
- diameters: 2-200mm;
- maximal thickness: 12mm (for meniscus shapes should be discussed additionally).
Please pay attention that this article is only for your information. We do not supply CVD-ZnS in blanks or as raw material. Our standard products are finished (polished, coated) parts.
Please link the following chapter to get more detailed information about ZnS optics: ZnS optics.
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