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

6.35mm Dia., 0.5mm Thick, NIR II AR Coated Sapphire Window

Stock #39-262 Other Coating Options
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Abbe Number (vd):
Axis Orientation:
Protective as needed
Birefringence (no-ne):
0.008 for Visible Light Orthogonal to Optical Axis
Clear Aperture (%):
Clear Aperture CA (mm):
Diameter (mm):
6.35 ±0.05
Thickness (mm):
0.50 ±0.05
NIR II (750-1550nm)
Coating Specification:
Rabs ≤1.5% @ 750 - 800nm
Rabs ≤1.0% @ 800 - 1550nm
Ravg ≤0.7% @ 750 - 1550nm
Coefficient of Thermal Expansion CTE (10-6/°C):
Density (g/cm3):
Fine Ground
Index of Refraction nd:
Knoop Hardness (kg/mm2):
Parallelism (arcmin):
Poisson's Ratio:
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:
Protective Window
Wavelength Range (nm):
750 - 1550
Young's Modulus (GPa):

Regulatory Compliance

RoHS 2015:
Reach 224:
Certificate of Conformance:

Product Family Description

  • Features Extreme Surface Hardness Chemical Resistance
  • Transmits Wavelengths Ranging From UV to Mid-Infrared
  • Thinner and Stronger than Standard Glass Windows
  • Anti-Reflection Coating Options Covering 400 - 5000nm Available

TECHSPEC® Sapphire Windows are manufactured from single crystal sapphire, making them ideal for demanding applications (such as laser systems) because of their extreme surface hardness, high thermal conductivity, high dielectric constant and resistance to common chemical acids and alkalis. Sapphire is the second hardest crystal next to diamond and, because of their structural strength, sapphire windows can be made much thinner than other common windows with improved transmittance. Chemically, sapphire is single crystal aluminum oxide (Al2O3) and is useful in a transmission range from 330 - 5500nm when uncoated. TECHSPEC® Sapphire Windows are available with anti-reflection (AR) coatings to improve performance in the visible, NIR, and IR spectra with coating options covering 400 - 5000nm.

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