Polycrystalline ZnS IR Window
Uncoated ZnS Window | Ø12.5 mm × 2.0 mm
Uncoated Ø12.5mm x 2.0mm ZnS window with 40-20 surface quality and
Product Overview
This precision uncoated Polycrystalline Zinc Sulfide (ZnS) optical window is engineered for high-performance infrared applications across the MWIR and LWIR spectral ranges. Offering high spectral transmittance, thermal stability, and mechanical strength, this Ø12.5 mm component serves as an effective protective window for industrial pyrometry, thermal imaging systems, and gas detection spectroscopy modules.
Key Specifications
| Parameter | Specification |
|---|---|
| Material | Polycrystalline Zinc Sulfide (ZnS) |
| Diameter | 12.5 mm (+0.0 / -0.1 mm) |
| Thickness | 2.0 mm (±0.1 mm) |
| Surface Quality | 40-20 Scratch-Dig |
| Surface Flatness | 1λ @ 633 nm |
| Parallelism | <1 arcmin |
| Coating | Uncoated |
| Clear Aperture | >90% of diameter |
Material & Optical Characteristics
Polycrystalline ZnS is widely utilized in infrared optical designs due to its broad optical transmission band extending from the visible spectrum up to approximately 14 µm. It provides reliable physical integrity and chemical resistance in harsh industrial operating environments.
Typical Applications
Based on its optical transmission profile and mechanical robustness, this component is ideally suited for:
Industrial Pyrometry: Protective optical barriers for non-contact temperature sensors and infrared pyrometers.
Gas Analysis & IR Spectroscopy: Sample cells and viewing windows for mid- and long-wave infrared gas detection.
Thermal Imaging Assemblies: Front protective windows for LWIR and MWIR thermal cameras.
Engineering & Selection Notes
When selecting a ZnS window for your infrared optical system, consider the following technical factors:
Reflective Losses: Uncoated Zinc Sulfide experiences Fresnel reflection losses (refractive index ~2.2 in the LWIR spectrum). For high-throughput applications, anti-reflective (AR) coatings can be applied to maximize transmission.
Environmental Protection: For extreme outdoor or defense environments, specialized broadband hard coatings or Diamond-Like Carbon (DLC) coatings can be evaluated upon request.
Customization & Manufacturing Capabilities
OPTOStokes provides full optical fabrication and custom thin-film coating capabilities. We can customize ZnS components according to your precise system requirements:
Custom diameters, rectangular dimensions, and thickness options.
Custom surface tolerances, wedges, or tighter optical flatness tolerances.
Precision optical coatings, including BBAR (Broadband Anti-Reflective) for MWIR/LWIR bands.
Contact our engineering team with your drawing, operating wavelength range, required quantity, and coating specifications for a detailed technical evaluation and custom quotation.