Zinc Sulfide (ZnS) Windows
CVD ZnS Windows:
- Thermal Imaging Systems: Ideal for forward-looking infrared (FLIR) applications in the LWIR range.
- Extreme Conditions: Suitable for use as exterior IR windows on aircraft frames due to their high fracture strength and durability.
Multispectral ZnS (Cleartran) Windows:
- Visible and Infrared Systems: Exceptional for applications requiring broad-spectrum transmission from visible to IR regions.
- Laser Rangefinders: Suitable for use in laser rangefinders due to their excellent optical properties.
- Detectors: Perfect for mid-wave infrared (MWIR) and long-wave infrared (LWIR) detectors.
Zinc Sulfide (ZnS) Windows provided by Kingwin Optics are available in two primary categories: CVD ZnS and Multispectral ZnS (Cleartran). These windows are renowned for their superior optical and mechanical properties, making them suitable for a wide range of applications, particularly in the infrared (IR) spectrum.
Types of Zinc Sulfide Windows:
1.CVD ZnS (Chemical Vapor Deposition Zinc Sulfide)
- Transmission Range: 7 to 14 µm (LWIR)
- Properties: Polycrystalline, high resistance to fracture, superior hardness, excellent chemical resistance, and low cost.
- Applications: Primarily used in thermal imaging systems operating in the long-wave infrared (LWIR) region.
2.Multispectral ZnS (Cleartran)
- Transmission Range: 0.4 to 14.0 µm (Visible to IR)
- Properties: Undergoes a post-deposition hot isostatic press process to eliminate microscopic voids and defects, enhancing the transmission range to include both visible and IR spectra.
- Applications: Suitable for a wide range of applications spanning from visible cameras to mid-wave and long-wave detectors, as well as laser rangefinders.
Physical and Optical Properties:
| Materials | CVD ZnS or Multispectral ZnS (Cleartran) |
| Aperture | >90% |
| Dimension Tolerance | +0.0/-0.2mm |
| Thickness Tolerance | +/-0.1mm |
| Surface Quality | 60/40 S/D |
| Chamfer | 0.3-0.5mmx45degree |
| Coating | AR/AR coating@7-14μm |
| 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 |
| Thermal Conductivity | 27.2 W m-1 K-1 at 298K |
| Melting Point | 1827°C (See notes below) |
| Hardness | Knoop 160 with 50g indenter |
| Thermal Expansion | 6.5 x 10-6 /°C at 273K |
| Dielectric Constant | 88 |
| Specific Heat Capacity | 515 J Kg-1 K-1 |
| Density | 4.09 g/cc |
| 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 poly-crystalline cubic, ZnS, F42m |
Customization Options:
Kingwin Optics offers a range of customization options for ZnS windows, including:
- Shapes: Various custom shapes are available to suit specific application requirements.
- Coatings: Anti-reflection (AR) coatings on both surfaces to enhance transmission and reduce reflections.
- Sizes: Custom dimensions to meet the precise needs of different optical systems.
Applications:
1.CVD ZnS Windows:
- Thermal Imaging Systems: Ideal for forward-looking infrared (FLIR) applications in the LWIR range.
- Extreme Conditions: Suitable for use as exterior IR windows on aircraft frames due to their high fracture strength and durability.
2.Multispectral ZnS (Cleartran) Windows:
- Visible and Infrared Systems: Exceptional for applications requiring broad-spectrum transmission from visible to IR regions.
- Laser Rangefinders: Suitable for use in laser rangefinders due to their excellent optical properties.
- Detectors: Perfect for mid-wave infrared (MWIR) and long-wave infrared (LWIR) detectors.
Zinc Sulfide Windows from Kingwin Optics offer unparalleled performance in both CVD and Multispectral (Cleartran) forms. With their high fracture strength, superior hardness, and broad transmission ranges, these windows are ideal for a variety of demanding optical applications. Whether you need robust windows for extreme conditions or versatile windows for visible and IR applications, Kingwin Optics provides customized solutions to meet your specific needs.
