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Abbe Number (vd):
64.17
Bevel:
Protective as needed
Clear Aperture (%):
90
Clear Aperture CA (mm):
22.50
Diameter (mm):
25.00 +0.0/-0.25
Thickness (mm):
2.00 ±0.20
Coating:
NIR I (600-1050nm)
Coating Specification:
Ravg ≤0.5% @ 600 - 1050nm
Coefficient of Thermal Expansion CTE (10-6/°C):
7.1 (-30 to +70°C) 8.3 (+20 to +300°C)
Density (g/cm3):
2.51
Edges:
Fine Ground
Index of Refraction nd:
1.516
Knoop Hardness (kg/mm2):
610
Parallelism (arcmin):
<1
Poisson's Ratio:
0.206
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.
TECHSPEC® λ/4 N-BK7 Precision Windows are ideally suited for industrial and low power laser applications. The high tolerance design yields minimal beam distortion and scatter. Broadband coating options extend the range of these precision windows through the visible and near-infrared spectra.
Note: New additions to this product family may be specified with a transmitted wavefront distortion (TWD) specification instead of a surface flatness. For more information on the difference between these two specifications, see our application note on Understanding Optical Windows.
TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More
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