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All Products / Optics / Windows and Diffusers / UV and IR Windows / ISP Optics Sapphire Windows
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25.4mm Dia., 1mm Thick, Uncoated, ISP Optics Sapphire Window | AL-W-25-1

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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
Clear Aperture (%):
85
Clear Aperture CA (mm):
21.59
Diameter (mm):
25.40 +0.00/-0.13
Thickness (mm):
1.00 ±0.13
Coating:
Uncoated
Coefficient of Thermal Expansion CTE (10-6/°C):
8.8
Density (g/cm3):
3.97
Edges:
Fine Ground
Index of Refraction nd:
1.77
Knoop Hardness (kg/mm2):
1900
Parallelism (arcmin):
<3
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 per 25.4mm
Surface Quality:
60-40
Type:
Protective Window
Wavelength Range (nm):
330 - 5500
Young's Modulus (GPa):
435
Model Number:
AL-W-25-1

Regulatory Compliance

RoHS:
Compliant
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Certificate of Conformance:
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Product Family Description

  • High Corrosion Resistance and Thermal Stability
  • Higher Durability than Glass Windows
  • Transmission from 0.33 – 5.5µm

ISP Optics Sapphire Windows are highly durable and transmissive protective windows that are ideal for harsh environments. Sapphire is chemically inert, insoluble in water, and resistant to common acids and alkalis. Chemically, sapphire is single crystal aluminum oxide (Al2O3) and is useful in a transmission range from 0.33 – 5.5µm when uncoated. ISP Optics Sapphire Windows feature a Knoop Hardness of 1900 and are are resistant to scratches, digs, and fractures that might otherwise weaken fused silica substrates. These windows are often used in applications with high temperatures and pressure such as viewports for vacuum or plasma chambers.