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Abbe Number (vd):
58.3
Bevel:
Protective as needed
Clear Aperture CA (mm):
13.50
Diameter (mm):
15.00 ±0.25
Thickness (mm):
2.00
Coating:
MgF2 (632.8nm)
Coating Specification:
Ravg ≤1.50% @ 632.8nm (N-BK7)
Coefficient of Thermal Expansion CTE (10-6/°C):
9.4 (+20 to +300°C)
Density (g/cm3):
2.56
Edges:
Fine Ground
Index of Refraction nd:
1.523
Knoop Hardness (kg/mm2):
500
Poisson's Ratio:
0.22
Substrate:
Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Damage Threshold, By Design:
Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification.
Available Uncoated, MgF2, or VIS-NIR Anti-Reflection (AR) Coated
Custom Sizes Available for Volume OEM Requirements
TECHSPEC® B270 Windows offer a high transmission from the visible to the near infrared (NIR) and have a similar refractive index to N-BK7 while being more cost effective. These windows are often used as a protective element due to their high solarization stability and chemical resistance making them ideal for standard window applications. TECHSPEC® B270 Windows are available either uncoated, or coated with a MgF2 or VIS-NIR Anti-Reflection (AR) Coating. Custom sizes and coatings are available for OEM applications.
TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More
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