ZnS Windows
ZnS is a very important optical crystals applied in IR waveband. Transmitting range of CVD ZnS is 8um-14um, high transmittance, low absorption, ZnS with multi-spectrum level by heating etc. static pressure technics has improved the transmittance of IR and visible range. Zinc Sulphide is produced by synthesis from Zinc vapour and H₂S gas, forming as sheets on Graphite susceptors. Zinc Sulphide is microcrystalline in structure, the grain size being controlled to produce maximum strength. Multispectral grade is then Hot Isostatically Pressed (HIP) to improve the mid IR transmission and produce the visibly clear form. Single crystal ZnS is available, but is not common. Zinc Sulphide oxidizes significantly at 300°C, exhibits plastic deformation at about 500°C and dissociates about 700°C. For safety, Zinc Sulphide windows should not be used above 250°C in normal atmosphere. Material: ZnS Diameter Tolerance: +0.0/-0.1mm Thickness Tolerance: +/-0.1mm Surface Figure: λ/10@633nm Parallelism: <1' Surface Quality: Surface Quality Clear Aperture: >90% Bevelling: <0.2×45° Coating: Custom Design Elastic Coefficients: Not Avalailable
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Overview
Specifications
| Parameter | Value |
|---|---|
| Transmission Range | 0.37 to 13.5 μm |
| Refractive Index [10 μm] | 2.20084 at 10 μm |
| Reflection Loss [10 μm；2 surfaces] | 24.7% at 10 μm (2 surfaces) |
| Absorption Coefficient [3.8 μm] | 0.0006 cm⁻¹ at 3.8 μm |
| Reststrahlen Peak | 30.5 μm |
| dn/dT [3.39 μm] | +38.7 x 10⁻⁶ /°C at 3.39 μm |
| Density | 4.09 g/cc |
| Melting Point | 1827°C (See notes below) |
| Thermal Conductivity [298K] | 27.2 W m⁻¹ K⁻¹ at 298K |
| Thermal Expansion [273K] | 6.5 x 10⁻⁶ /°C at 273K |
| Hardness [50g indenter] | Knoop 160 with 50g indenter |
| Specific Heat Capacity | 515 J Kg⁻¹ K⁻¹ |
| Dielectric Constant | 88 |
| Youngs Modulus (E) | 74.5 GPa |
| Apparent Elastic Limit | 68.9 MPa (10,000 psi) |
| Poisson Ratio | 0.28 |
| Solubility [water] | 65 x 10⁻⁶ g/100g water |
| Molecular Weight | 97.43 |
| Class/Structure | HIP polycrystalline cubic, ZnS, F42m |
| Material | ZnS |
| Diameter Tolerance | +0.0/-0.1mm |
| Thickness Tolerance | ±0.1mm |
| Surface Accuracy [632.8nm] | λ/4@632.8nm |
| Parallelism | <1′ |
| Surface Quality | 60-40 |
| Clear Aperture | >90% |
| Bevelling | <0.2×45° |
| Coating | Custom Design |
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