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23.9mm Dia., 3.5mm Thick, Uncoated, N-BK7 Window

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Stock #14-268 Clearance
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$22.50
Qty 1-5
$22.50
Qty 6+
$18.00
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Abbe Number (vd):
64.17
Bevel:
Protective as needed
Clear Aperture (%):
90
Diameter (mm):
23.90 ±0.10
Thickness (mm):
3.50 ±0.10
Coating:
Uncoated
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):
<3
Poisson's Ratio:
0.206
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Flatness:
<2λ/inch @ 633nm
Surface Quality:
40-20
Type:
Protective Window
Wavelength Range (nm):
350 - 2200
Young's Modulus (GPa):
82

Regulatory Compliance

RoHS:

Product Family Description

N-BK7 windows are ideally suited for industrial applications. Available uncoated or with a MgF2 anti-reflection coating, windows are often used as a protective element between two environments. Commercial Grade N-BK7 Windows offer commercial quality, at an affordable price.

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