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40mm Dia. x 4mm MgF2 Coated, N-BK7 Window

Stock #27-855 Clearance
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$29.75
Qty 1-5
$29.75
Qty 6+
$23.80
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Abbe Number (vd):
64.17
Bevel:
Protective as needed
Clear Aperture CA (mm):
36.00
Diameter (mm):
40.00 ±0.25
Thickness (mm):
4.00 ±0.20
Coating:
MgF2 (400-700nm)
Coating Specification:
MgF2: ¼λ @ 550nm, Ravg ≤1.75% @ 400 - 700nm
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):
≤5
Poisson's Ratio:
0.206
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Accuracy:
Type:
Protective Window
Wavelength Range (nm):
400 - 700
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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