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Zinc Sulfide Windows (ZnS)
Zinc sulfide windows are optical windows commonly used in infrared and visible light. Coligh manufactures it with <1000mm diameter and customized any shape.
- Broad spectral transmittance: High transmittance from 350 nm to 12 μm
- High strength and mechanical durability
- Low absorption loss
- Available in any size and shape up to <1000 mm
- Custom optical coatings available
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Zinc Sulfide Optical Multispectral Windows Description
Coligh specializes in the production of various high-precision, high-performance zinc sulfide (ZnS) multispectral windows. Our ZnS windows feature the following highlights:
- Broad Spectral Coverage: Transmittance from visible light (400-700 nm) to near-infrared (NIR), mid-infrared (MIR), and far-infrared, supporting the design of multispectral systems and suitable for multimodal imaging systems, such as visible light + infrared fusion detection.
- Exceptional Mechanical Properties: With a flexural strength of ≥68 MPa, a low thermal expansion coefficient of 7.2×10⁻⁶/℃, and a Knoop hardness (kg/mm²)>160, our ZnS windows can operate stably in extreme environments, such as aerospace and industrial inspection applications.
- Low Absorption Loss: An absorption coefficient of <0.01 cm⁻¹ (@10.6 μm) minimizes thermal lensing effects, making them ideal for high-power laser systems.
- We support the production of large-size windows (up to ≤1000 mm), meeting the demands of large-scale optical systems.
- Our ZnS windows can be customized into various shapes, including flat, spherical, aspherical, or irregular structures (e.g., rings, polygons), to adapt to complex optical designs.
Additionally, we offer customized coating services, such as anti-reflective coatings, high-reflective coatings, and diamond-like carbon (DLC) coatings, to enhance performance for specific applications.
Zinc Sulfide Optical Multispectral Windows Detail Display
Zinc Sulfide Optical Windows Technical Specification
| ZnS Specification | Value |
| Type | Multispectral CVD ZnS |
| Wavelength Range | 0.35-12 µm |
| Transmittance | >72% |
| Density (g/cm³) | 4.09 |
| Bending Strength (MPa) | 68 |
| Knoop Hardness (kg/mm²) | >160 |
| Thermal Expansion Coefficient 1/°C) | 7.2 × 10⁻⁶ |
| Poisson’s Ratio | 0.28 |
| Thermal Conductivity (W/(m·K)) | 27.2 |
| Thermal Expansion (×10⁻⁶/K) | 7 |
| Custom Solution Specification | |
| Size | 5-1000mm |
| Size Tolerance | ±0.1mm |
| Shape | Any shape |
| Surface Quality | 60-40, 40-20, 20-10 |
| Surface Figure | Full Aperture 13/60nm |
| Parallelism | 0.25” |
| Clear Aperture | >95% |
| Beveling | Protective Beveling |
| Coatings | AR, HR, DLC |
Zinc Sulfide Optical Windows Applications
Large-sized zinc sulfide optical windows have important applications in many high-end fields. Mainly used in the following scenarios:
Aerospace and defense
- Large-sized zinc sulfide optical windows can be used as infrared windows for infrared guidance heads, reconnaissance aircraft, drones, and earth observation satellites. They can withstand startup heating and impact, and enhance the detection and survivability of aircraft in complex environments.
High-power laser systems
- Large-sized zinc sulfide optical windows can be used as output windows for industrial laser processing equipment, suitable for large laser cutting and welding equipment, supporting kilowatt-level laser power transmission, and ensuring processing accuracy.
Astronomical observation
- As a protective window for large infrared astronomical telescopes, it can support astronomical observations in the infrared band and infrared imaging systems for deep space probes.
Industrial detection
- In the application scenario of high-temperature industrial detection, zinc sulfide windows are used as observation windows for high-temperature furnaces and molten metal containers, supporting real-time temperature monitoring and process control.
