Zinc Sulfide (ZnS) dome
Zinc sulfide (ZnS) is a broad-band (3.72 eV) group II-VI semiconductor material with high optical transmittance in the near-infrared (1-3 μm), mid-infrared (3-5 μm), far-infrared (8-12 μm) and other spectral bands, with moderate mechanical properties, thermal properties and chemical stability, and is an important class of optoelectronic functional materials. The multi-spectral band transmittance ZnS materials are widely used in infrared optics and other fields.
ZnS Optical Domes are ideally suited for wavelengths from 600 nm to 12 microns and offer 160 degree maximum included angles to extend the viewing angle of missile guidance systems. Designed to protect cameras, detectors, sensors, and other devices, they provide up to 70% transmission uncoated in the visible through Mid-IR spectra.
Our Company can provide optical glass dome with diameters from 5-280mm (accuracy up to 60-40, 1/10-1L@633nm), uncoated or upon request.
Technical parameters of Zinc Sulfide (ZnS) dome
Material | Zns |
Diameter range | 5mm-280mm |
Diameter tolerance | +/-0.03mm |
Surface accuracy | 1/10-1 lambda |
Surface quality | 60/40 |
Clear Aperature | 90% |
Coating | Uncoated or customized |
Material properties of Zns
| Physical Properties | CVD Zns | Multispectral CVD Zns |
| Density[g/cm3] | 4.09 | 4.09 |
| Resistivity[Ω.cm] | ～1012 | ～101.3 |
| Melting Point [℃] | 1827 | |
| Chemical purity[%] | 99.9996 | 99.9996 |
| Thermal Expansion [1/K] | 6.6*10-6@273k | 6.3*10-6@273k |
| 7.3*10-6@373k | 7.0*10-6@373k | |
| ThermalConductivity [J/k.m.s] | 16.7@298k | 27.2@298k |
| Specific Heat Capacity [J/g.K] | 0.469@298k | 0.515@298k |
| Knoop Hardness [kg/mm2] | 200-235 | 160 |
| Bending strength [Mpa] | 103 | |
| Young's Modulus [GPa] | 74.5 | 74.5 |
| Poisson's coefficient | 0.29 | 0.29 |
| Optical Properties | CVD Zns | Multispectral CVD Zns |
| ransmission Range | 1-14μm | 0.37-14μm |
| Refractive index inhomogeneity[△n/n] | <7.3*10-4@10.6μm | <0.2*10-4@632.8nm |
| Absorption coefficient | 0.2@10.6μm | 0.2@10.6μm |
| [1/cm] | ||
| Thermal light coefficient | 4.6*10-5@1150nm | 5.43*10-5@632.8nm |
| [1/k,298-358k] | 4.3*10-5@3390nm | 4.21*10-5@1150nm |
| 4.1*10-5@10.6μm | 3.87*10-5@3390nm |
Transmission curve
The transmission curve of standard CVD zinc sulfide, at (20±3)℃ temperature, is shown in the figure. The transmission in the spectral range from 8μm to 10μm should not be less than 70%; The transmission curve in the spectral range from 3μm to 10μm should not have other absorption peaks except for the absorption peak near 6μm.
The transmission curves of the multispectral CVD zinc sulfide at (20±3)℃ are shown in Fig. The transmittance at 1064 nm is not less than 70%, and the transmittance in the spectral range from 3 μm to 5 μm is not less than69%, and the transmittance curve is smooth without absorption peak; The transmittance in the spectral range from 8 μm to 10 μm is not less than 70%.
