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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

25.4mm Dia. x 3mm Thickness 3-5µm Coated Silicon Window

TECHSPEC Silicon (Si) Windows

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Stock #20-038 3-5 days
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S$311.75
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S$311.75
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S$275.50
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Product Details

Type:
Protective Window

Physical & Mechanical Properties

Bevel:
Protective as needed
Clear Aperture (%):
90.00
Clear Aperture CA (mm):
22.86
Diameter (mm):
25.40 +0.0/-0.1
Thickness (mm):
3.00 ±0.1
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
1150
Parallelism (arcmin):
<3
Poisson's Ratio:
0.265
Young's Modulus (GPa):
140

Optical Properties

Coating:
BBAR (3000-5000nm)
Coating Specification:
Ravg <3.0% @ 3 - 5μm
Index of Refraction nd:
3.422 @ 5µm
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Silicon (Si)
Surface Flatness (P-V):
Surface Quality:
60-40
Wavelength Range (nm):
3000 - 5000

Material Properties

Coefficient of Thermal Expansion CTE (10-6/°C):
2.55
Density (g/cm3):
2.33

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
REACH 241:

Product Family Description

  • 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. 

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