Optics Silicon (Si) Window

Key Features:

  1. Transmission Range:
    • Wavelength Range: 1.2 – 7 µm
    • Provides excellent transmission in both the Near-Infrared (NIR) and Mid-Wave Infrared (MWIR) regions, making it suitable for a wide range of IR applications.
  2. Coating Options:
    • Uncoated: Available for applications where coating is not required.
    • HDAR Coating: High-Durability Anti-Reflection (HDAR) coating specifically designed for the 3 – 5 µm range, enhancing durability and improving transmission.
  3. Weight-Sensitive Applications:
    • Low Density: Silicon’s density is 2.329 g/cm³, which is about half the density of Germanium and Zinc Selenide, making it ideal for applications where weight is a critical factor.




Product Specification:

  • Bevel: Protective as needed
  • Clear Aperture CA (mm):
  • Clear Aperture (%): 85
  • Thickness (mm):– ±0.13
  • Diameter (mm):  +0.00/-0.13
  • 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: 40-20
  • Type: Protective Window
  • Wavelength Range (nm): 1200 – 7000
  • Young’s Modulus (GPa): 140
  • Model Number: SI-W-12-1

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. Hardness and Durability:
    • Knoop Hardness: 1150, making it harder and less brittle compared to Germanium, providing better durability and resistance to mechanical damage.
  2. Transmission Properties:
    • Broad Transmission: Effective transmission from 1.2 µm to 7 µm, covering both NIR and MWIR regions.
    • Enhanced Transmission: The HDAR coating significantly improves transmission in the 3 – 5 µm range and adds durability for use in harsh environments.
  3. Mechanical and Physical Properties:
    • Density: Low density of 2.329 g/cm³, beneficial for weight-sensitive applications.
    • Durability: Suitable for use in environments where resistance to abrasion and mechanical stress is important.


  1. Infrared Imaging:
    • NIR Imaging: Ideal for near-infrared imaging applications, providing high transmission and clarity.
    • MWIR Imaging: Suitable for mid-wave infrared imaging, especially with the HDAR coating for enhanced performance.
  2. Industrial Sensing:
    • Weight-Sensitive Sensors: Used in sensors and devices where minimizing weight is crucial, such as in portable or airborne systems.
    • Environmental Monitoring: Suitable for industrial and environmental monitoring applications where durability and transmission in the IR range are needed.
  3. Aerospace and Defense:
    • Thermal Imaging: Utilized in thermal imaging systems for defense and surveillance that operate in the 3 – 5 µm range.
    • Weight-Sensitive Equipment: Ideal for aerospace applications where every gram counts, thanks to its low density.
  4. Scientific Research:
    • Spectroscopy: Employed in spectroscopic applications that require broad IR transmission and durable optics.
    • Black Body Detection: Important for detecting sources radiating at a black body temperature of 700K.

SHAPE Optics Silicon (Si) Windows provide versatile and durable solutions for a range of infrared applications, particularly in the NIR and MWIR regions. Their low density makes them ideal for weight-sensitive applications, while the option for HDAR coating enhances their performance and durability in harsh environments. These windows are particularly suited for high-precision IR imaging, industrial sensing, and aerospace applications, offering reliable and robust optical performance.

Additional information

Weight 0.5 kg
Dimensions 12 × 10 × 8 cm


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