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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

Silicon (Si) Windows

TECHSPEC Silicon (Si) Windows

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  • Transmission from 1.2 - 7μm
  • Available Uncoated or AR Coated for 1.65 - 5μm
  • Ideal for Weight Sensitive Applications

TECHSPEC® Silicon (Si) Windows manufactured from optical grade silicon are popular for the 1.2 - 7μm spectral region due to their low cost and low density. Due to its low density (half that of germanium or zinc selenide), silicon is ideal for weight sensitive applications, especially those in the 1.65 - 5μm region. Density is 2.329 g/cm3 and Knoop Hardness is 1150, making it harder and less brittle than germanium. TECHSPEC® Silicon (Si) Windows available uncoated or AR coated for 1.65 - 5μm. These crystal windows are offered in diameters ranging from 10 – 76.20mm. 

Common Specifications

Bevel:
Protective as needed
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
1150
Parallelism (arcmin):
<3
Poisson's Ratio:
0.265
Young's Modulus (GPa):
140
Index of Refraction (nd):
3.422 @ 5µm
Substrate:
Silicon (Si)
Surface Quality:
60-40
Coefficient of Thermal Expansion CTE (10-6/°C):
2.55
Density (g/cm3):
2.33

Products

Dia. (mm)  Thickness (mm)   Coating   Compare   Stock Number   Price  Buy
10.00 1.50 Uncoated
10.00 1.50 BBAR (1650-3000nm)
10.00 1.50 BBAR (3000-5000nm)
12.50 2.00 Uncoated
12.50 2.00 BBAR (1650-3000nm)
12.50 2.00 BBAR (3000-5000nm)
12.70 2.00 Uncoated
12.70 2.00 BBAR (1650-3000nm)
12.70 2.00 BBAR (3000-5000nm)
25.00 1.00 Uncoated
25.00 1.00 BBAR (1650-3000nm)
25.00 1.00 BBAR (3000-5000nm)
25.00 2.00 Uncoated
25.00 2.00 BBAR (1650-3000nm)
25.00 2.00 BBAR (3000-5000nm)
25.00 3.00 Uncoated
25.00 3.00 BBAR (1650-3000nm)
25.00 3.00 BBAR (3000-5000nm)
25.40 1.00 Uncoated
25.40 1.00 BBAR (1650-3000nm)
25.40 1.00 BBAR (3000-5000nm)
25.40 2.00 Uncoated
25.40 2.00 BBAR (1650-3000nm)
25.40 2.00 BBAR (3000-5000nm)
25.40 3.00 Uncoated
25.40 3.00 BBAR (1650-3000nm)
25.40 3.00 BBAR (3000-5000nm)
30.00 2.00 Uncoated
30.00 2.00 BBAR (1650-3000nm)
30.00 2.00 BBAR (3000-5000nm)
50.00 1.00 Uncoated
50.00 1.00 BBAR (1650-3000nm)
50.00 1.00 BBAR (3000-5000nm)
50.00 2.00 Uncoated
50.00 2.00 BBAR (1650-3000nm)
50.00 2.00 BBAR (3000-5000nm)
50.00 3.00 Uncoated
50.00 3.00 BBAR (1650-3000nm)
50.00 3.00 BBAR (3000-5000nm)
50.80 1.00 Uncoated
50.80 1.00 BBAR (1650-3000nm)
50.80 1.00 BBAR (3000-5000nm)
50.80 2.00 Uncoated
50.80 2.00 BBAR (1650-3000nm)
50.80 2.00 BBAR (3000-5000nm)
50.80 3.00 Uncoated
50.80 3.00 BBAR (1650-3000nm)
50.80 3.00 BBAR (3000-5000nm)

Technical Information

Custom

Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion.

Our capabilities include:

  • Custom dimensions, materials, coatings, and more
  • High-precision surface quality and flatness
  • Tight tolerances and complex geometries
  • Scalable production—from prototype to volume

Learn more about our custom manufacturing capabilities or submit an inquiry here.