Specifications:
| Materials | CVD ZnS or Multispectral ZnS (Cleartran) | Diameter Range | ~200mm |
| Diameter Tolerance | +0.0/-0.2mm | Thickness Tolerance | +/-0.2mm |
| Surface Quality | 60/40 S/D | Fringes (N) | 3 |
| Irregularity (delta N) | 1 | Centration | 3' |
| Chamfer | 0.1-0.3mmx45 degree | Coatings | AR/AR@7-14micro |
Physical and Optical Properties:
| Transmission Range | 0.37 to 13.5 μm | Refractive Index | 2.20084 at 10 μm |
| Reflection Loss | 24.7% at 10 μm (2 surfaces) | Absorption Coefficient | 0.0006 cm-1 at 3.8 μm |
| Reststrahlen Peak | 30.5 μm | dn/dT | +38.7 x 10-6/°C at 3.39 μm |
| dn/dμ = 0 | n/a | Density | 4.09 g/cc |
| Melting Point | 1827°C (See notes below) | Thermal Conductivity | 27.2 W m-1 K-1 at 298K |
| Thermal Expansion | 6.5 x 10-6 /°C at 273K | Hardness | Knoop 160 with 50g indenter |
| Specific Heat Capacity | 515 J Kg-1 K-1 | Dielectric Constant | 88 |
| Youngs Modulus (E) | 74.5 GPa | Shear Modulus (G) | n/a |
| Bulk Modulus (K) | n/a | Elastic Coefficients | Not Avalailable |
| Apparent Elastic Limit | 68.9 MPa (10,000 psi) | Poisson Ratio | 0.28 |
| Solubility | 65 x 10-6 g/100g water | Molecular Weight | 97.43 |
| Class/Structure | HIP polycrystalline cubic, ZnS, F42m |
Shanghai North Optics provides ZnS Lenses made of Chemical Vapor Deposition (CVD) Zinc Sulfide or Multispectral Zinc Sulfide (also called Cleartran or water-clear ZnS). Both the two kinds of ZnS have become favorable in extreme conditions due to their high fracture strength which far exceeds that of ZnSe and mechanical robustness. In comparison, CVD ZnS is harder than Cleartran and is used for LWIR spectrum from 7 to 14 micro; whilst the multispectral ZnS, which is a special form of CVD ZnS with the zinc hydrides removed using a hot isostatic process, exhibits a broader transmission range spanning from the VIS to IR region (0.4-14μm), and the additional advantages of chemical inertness and low scattering.
Curves:
1. Transmission Curve of 3mm Thickness AR Coated CVD ZnS Substrates at 7-14 micro
2. Transmission Curve of 3mm Thickness Multispectral ZnS at the Visible Wavelength Range
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