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All Products / Optics / Windows and Diffusers / UV and IR Windows / Sapphire Windows with Through Holes
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25.4mm Diameter, 19.1mm Through Hole, Sapphire Window

25.4mm Diameter, 19.1mm Through Hole, Sapphire Window

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Stock #17-212 In Stock
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Abbe Number (vd):
72.24
Axis Orientation:
Random
Bevel:
Protective as needed
Birefringence (no-ne):
0.008 for Visible Light Orthogonal to Optical Axis
Diameter (mm):
25.40 ±0.127
Through Hole Diameter (mm):
19.10 ±0.127
Thickness (mm):
1.00 ±0.127
Coating:
Uncoated
Coefficient of Thermal Expansion CTE (10-6/°C):
8.8
Density (g/cm3):
3.97
Index of Refraction nd:
1.77
Knoop Hardness (kg/mm2):
1900
Parallelism (arcmin):
≤3.5
Poisson's Ratio:
0.27
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Sapphire (Al2O3)
Surface Flatness (P-V):
2λ (typical)
Surface Quality:
80-50
Type:
Protective Window
Wavelength Range (nm):
330 - 5500
Young's Modulus (GPa):
435

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
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REACH 241:
Compliant
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Product Family Description

  • 25.4mm Diameter Sapphire Substrates
  • 3.2 - 19.1mm Through Hole Diameters
  • High Transmission From 0.33 - 5.5μm

Sapphire Windows with Through Holes, also referred to as sapphire washers, feature 25.4mm diameter sapphire substrates with a centered through hole ranging in diameter from 3.2 - 19.1mm. Sapphire offers extreme surface hardness second only to diamond, high thermal conductivity, and is chemically inert, making it ideal for use in harsh environments. These windows provide high transmission from 0.33 - 5.5μm and can be made much thinner than glass windows due to the structural strength of sapphire. Sapphire Windows with Through Holes can be manufactured as modified standard versions of our sapphire windows or as entirely custom products; please contact us to discuss your application requirements.