Uncoated, Optics Zinc Sulfide (ZnS) Window

Key Features:

  1. Low Absorption and Low Scatter:
    • Wavelength Range: 0.4 – 12 µm
    • ZnS windows exhibit minimal absorption and scattering across both the visible (VIS) and infrared (IR) spectrums, ensuring high transmission and image clarity.
  2. Higher Durability than Zinc Selenide (ZnSe):
    • Hardness: Slightly harder than ZnSe, making it more resistant to scratches and mechanical damage.
    • Chemical Resistance: More chemically resistant compared to ZnSe, enhancing durability in various environments.
  3. Ideal for Infrared Sensors:
    • Application Suitability: Perfect for use with infrared sensors, particularly in systems requiring both visible and mid-wave infrared (MWIR) or long-wave infrared (LWIR) detection.




SHAPE OPTICS Zinc Sulfide (ZnS) Clear Grade Protective Window Specifications

Parameter Specification
Bevel: Protective as needed
Clear Aperture CA (mm):
Clear Aperture (%): 85
Diameter (mm): – +0.00/-0.13
Thickness (mm):  ±0.13
Coating: Uncoated
Density (g/cm³): 4.08
Coefficient of Thermal Expansion CTE (10^-6/°C): 6.8
Edges: Fine Ground
Index of Refraction n_d: 2.371
Knoop Hardness (kg/mm²): 210
Poisson’s Ratio: 0.27
Parallelism (arcmin): <3
Substrate: Zinc Sulfide, Clear Grade
Surface Quality: 60-40
Surface Flatness (P-V): λ/20 @ 10.6µm
Type: Protective Window
Wavelength Range (nm): 400 – 12000
Young’s Modulus (GPa): 74.5
Model Number:

Material Characteristics:

  1. Chemical Vapor Deposition (CVD):
    • ZnS is produced using the CVD process, resulting in a high-purity material with excellent optical properties and mechanical strength.
  2. Optical Performance:
    • Transmission: High transmittance from visible to infrared wavelengths (0.4 – 12 µm).
    • Scatter: Low scatter ensures high-quality imaging and accurate sensor readings.
  3. Mechanical and Chemical Properties:
    • Hardness: Moderately hard, offering better durability than ZnSe.
    • Chemical Stability: Resistant to most acids and alkalis, with better chemical durability compared to ZnSe.


  1. Imaging Systems:
    • Dual Spectrum Imaging: Suitable for systems featuring both visible and thermal imaging paths.
    • Thermal Cameras: Used in thermal imaging cameras for clear IR transmission.
  2. Military and Defense:
    • Night Vision: Employed in night vision equipment that requires high IR transmittance and durability.
    • Missile Guidance: Used in missile guidance systems where both visible and IR sensors are needed.
  3. Industrial Sensing:
    • Environmental Monitoring: Ideal for sensors in environmental monitoring that detect infrared wavelengths.
    • Gas Detection: Used in industrial gas detection systems operating in the infrared spectrum.
  4. Scientific Research:
    • Spectroscopy: Used in spectroscopic applications requiring high transmittance across a broad range of wavelengths.
  5. Medical Imaging:
    • Infrared Thermography: Applied in medical imaging systems such as IR thermography, which benefit from ZnS’s low absorption and scatter properties.

SHAPE Optics Zinc Sulfide (ZnS) Windows offer a robust solution for a wide range of optical applications, particularly those requiring low absorption and scatter across a broad wavelength range. Their enhanced durability and chemical resistance make them a superior choice compared to Zinc Selenide, especially in systems that incorporate both visible and infrared sensors.

Additional information

Weight 0.5 kg
Dimensions 12 × 10 × 8 cm


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