ZnS
Cleartran ZnS Spherical Lenses
Cleartran ZnS spherical lenses for visible-to-LWIR multispectral focusing, collimation, and rugged optical assemblies with drawing-based engineering review.
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Zinc Sulfide (ZnS)
Zinc Sulfide (ZnS) optical material for multispectral windows, with local refractive-index data and absorption references for engineering review.
Key Properties
Primary engineering references for material screening, packaging review, and RFQ preparation.
Transmission Range
0.4 - 12 um
Refractive Index
2.1990 at 10.0 um
Density
4.09 g/cm3
Knoop Hardness
160 kg/mm2
Young's Modulus
74.5 GPa
Thermal Expansion
6.3 x 10^-6 /K @273 K; 7.0 x 10^-6 /K @373 K
About Zinc Sulfide (ZnS)
Overview
Zinc Sulfide (ZnS) is usually reviewed for multispectral windows and rugged optical paths that need visible-to-IR coverage. In practice, engineers should check not only refractive index, but also short-wave absorption behavior, coating strategy, and whether the system needs standard ZnS or a higher-spec multispectral grade.
Key Material Reference
| Parameter | Reference |
|---|---|
| Practical Transmission Guidance | 0.4-12.0 µm |
| Local RII Dataset Range | 0.22-166.67 µm |
| Reference Dataset | Querry tabulated n,k |
| Refractive Index | 2.1990 at 10.0 µm |
| Density | 4.09 g/cm3 |
| Knoop Hardness | 160 kg/mm2 |
| Young's Modulus | 74.5 GPa |
| Thermal Expansion | 6.3 x 10^-6 /K @273 K; 7.0 x 10^-6 /K @373 K |
Selected Refractive Index Reference
The values below are practical references from the local RII dataset. For multispectral windows, engineers should review both n and the approximate extinction trend in the intended band before locking substrate choice.
| Wavelength (µm) | Refractive Index | Approx. Extinction k |
|---|---|---|
| 0.400 | 2.5500 | 0.008 |
| 0.540 | 2.3840 | 0.000 |
| 1.000 | 2.2980 | 0.016 |
| 2.994 | 2.2620 | 0.000 |
| 5.000 | 2.2480 | 0.001 |
| 10.000 | 2.1990 | 0.002 |
| 12.500 | 2.1550 | 0.005 |
Typical Applications
- Multispectral imaging windows
- Infrared protective windows
- Visible-to-IR optical assemblies
- Harsh-environment optical systems
Engineering Notes
ZnS is usually selected for window duty rather than for the highest refractive power. Engineers should confirm the real transmission band, coating target, environmental exposure, and surface-finish requirement before release. Compare other candidate substrates through the materials index and the available fabrication routes under products if the design might also fit ZnSe or Ge.
Procurement Checklist
- State whether the part is a multispectral window, a protective window, or a substrate for further processing.
- Include wavelength band, dimensions, quantity, and coating target in the RFQ.
- Call out any environmental exposure, abrasion risk, or cleaning requirement that affects coating and inspection.
- If the system is image-quality sensitive, note the surface-quality and transmitted-wavefront expectation up front.
Request Engineering Review
Send wavelength band, dimensions, coating target, quantity, and application notes through the contact page for a practical ZnS review.
Material Properties
Material
Zinc Sulfide (ZnS)
Practical Transmission Guidance
0.4-12.0 um
Local Dataset Range
0.22-166.7 um
Reference Dataset
Querry tabulated n,k, local RII database
Reference Temperature
Not separately specified in the local dataset
Refractive Index
2.1990 at 10.0 um
Density
4.09 g/cm3
Knoop Hardness
160 kg/mm2
Young's Modulus
74.5 GPa
Thermal Expansion
6.3 x 10^-6 /K @273 K; 7.0 x 10^-6 /K @373 K
Common Applications
Multispectral imaging windowsInfrared protective windowsVisible-to-IR opticsHarsh-environment optical systems
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