Abbe Number (v_d):

64.17

Bevel:

Protective as needed

Clear Aperture (%):

90

Diameter (mm):

11.40 ±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 n_d:

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

N-BK7

Surface Flatness (P-V):

<2λ/inch @ 632.8nm

Surface Quality:

40-20

Type:

Protective Window

Wavelength Range (nm):

350 - 2200

Young's Modulus (GPa):

82

Regulatory Compliance

RoHS:

Compliant

Certificate of Conformance:

View

Product Family Description

Feature Standard Designs and Specifications
Commercial Grade Float Glass and Fused Silica Windows Also Available
For More Options, View Precision Quality Optical Windows

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.

11.4mm Dia., 3.5mm Thick, Uncoated, N-BK7 Window

Regulatory Compliance

Product Family Description