Uncoated, Silicon Window

Key Features:

  1. Transmission Range:
    • Wavelength Range: 1.2 – 7 µm
    • Ideal for a broad spectrum of applications spanning the Near-Infrared (NIR) to Mid-Wave Infrared (MWIR) regions.
  2. Coating Options:
    • Uncoated: Available for general-purpose use where coating is not necessary.
    • AR Coated for 1.65 – 5 µm: Anti-Reflection (AR) coating specifically designed for the 1.65 – 5 µm range, enhancing transmission and reducing reflections in this critical band.
  3. Weight-Sensitive Applications:
    • Low Density: With a density of 2.329 g/cm³, silicon is approximately half as dense as Germanium and Zinc Selenide, making it highly suitable for applications where weight is a critical consideration.




Product Specification:

  • Bevel: Protective as needed
  • Clear Aperture CA (mm):
  • Clear Aperture (%): 90.00
  • Thickness (mm):  ±0.1
  • Diameter (mm):  +0.0/-0.1
  • Coating: Uncoated
  • Coefficient of Thermal Expansion CTE (10⁻⁶/°C): 2.55
  • Density (g/cm³): 2.33
  • Index of Refraction n<sub>d</sub>: 3.422 @ 5µm
  • Parallelism (arcmin): <3
  • Edges: Fine Ground
  • Knoop Hardness (kg/mm²): 1150
  • Poisson’s Ratio: 0.265
  • Substrate: Silicon (Si)
  • Surface Flatness (P-V):
  • Surface Quality: 60-40
  • Type: Protective Window
  • Wavelength Range (nm): 1200 – 7000
  • Young’s Modulus (GPa): 140

For further assistance with customization or to place an order, please visit our online store or contact our sales team.

Material and Optical Properties:

  1. Mechanical Properties:
    • Knoop Hardness: 1150, making silicon harder and less brittle than Germanium, thus providing enhanced durability and resistance to mechanical stress.
  2. Transmission Properties:
    • Broad Transmission: Effective transmission from 1.2 µm to 7 µm, covering both NIR and MWIR regions.
    • Enhanced Performance: The AR coating for 1.65 – 5 µm improves transmission efficiency and reduces surface reflections, crucial for high-performance IR systems.
  3. Cost and Availability:
    • Low Cost: Silicon windows are cost-effective compared to other IR materials like Germanium and Zinc Selenide, making them popular for a variety of applications.
    • Versatile Sizing: Available in diameters ranging from 10 mm to 76.20 mm, accommodating different application needs.


  1. Infrared Imaging:
    • NIR and MWIR Imaging: Perfect for applications requiring high transmission in the 1.2 – 7 µm range, such as thermal imaging cameras and IR sensors.
    • AR Coated Systems: Enhanced performance in the 1.65 – 5 µm range for critical imaging and sensing applications.
  2. Industrial Sensing:
    • Weight-Sensitive Devices: Ideal for portable or airborne IR sensing equipment where minimizing weight is crucial.
    • Environmental Monitoring: Used in sensors for environmental monitoring requiring durable and lightweight optical components.
  3. Aerospace and Defense:
    • Surveillance and Reconnaissance: Suitable for aerospace and defense applications, providing reliable performance in weight-sensitive and harsh environments.
    • Thermal Imaging Systems: Utilized in systems operating within the 1.65 – 5 µm range, especially those requiring enhanced transmission and durability.
  4. Scientific Research:
    • Spectroscopy: Applied in spectroscopic instruments needing broad IR transmission and durable optics.
    • General Research: Ideal for experiments and applications requiring robust and cost-effective IR window solutions.

SHAPEOPTICS Silicon (Si) Windows offer a cost-effective and versatile solution for a wide range of infrared applications, particularly in the NIR and MWIR regions. Their low density and high hardness make them suitable for weight-sensitive and durable applications, respectively. With options for uncoated and AR-coated windows, these silicon optics provide enhanced performance and reliability, making them a preferred choice for industrial, aerospace, defense, and scientific applications.

Additional information

Weight 0.5 kg
Dimensions 12 × 10 × 8 cm


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