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Products / Optics / Windows and Diffusers / Visible Windows / λ/4 N-BK7 Precision Windows
See all 126 Products in Family

TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More
40mm Dia., 4mm Thick, VIS-NIR Coated λ/4 N-BK7 Window

Stock #48-446
€92.50
×
Qty 1-5
€92.50
Qty 6
€74.00
Volume Pricing
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Abbe Number (vd):
64.17
Clear Aperture (%):
90
Diameter (mm):
40.00 +0.0/-0.25
Thickness (mm):
4.00
Coating:
VIS-NIR (400-1000nm)
Coating Specification:
Rabs ≤0.25% @ 880nm
Ravg ≤1.25% @ 400 - 870 nm
Ravg ≤1.25% @ 890 - 1000nm
Coefficient of Thermal Expansion CTE (10-6/°C):
7.1
Knoop Hardness (GPa):
610
Young's Modulus (GPa):
82
Density (g/cm3):
2.51
Index of Refraction nd:
1.516
Parallelism (arcmin):
1.00
Poisson's Ratio:
0.206
Substrate:
N-BK7
Surface Flatness:
λ/4
Surface Quality:
60-40
Thickness Tolerance (mm):
±0.20
Type:
Protective Window
Typical Energy Density Limit:
5 J/cm2 @ 532nm, 10ns
Wavelength Range (nm):
400 - 1000

Regulatory Compliance

RoHS 2015:
Compliant
×
REACH 201:
Compliant
×

Product Family Description

  • λ/4 Surface Flatness
  • Broadband Anti-Reflection Coating Options Available
  • Custom Coatings and Sizes Available for Volume OEM Quantities
  • Also Available with Laser Line V-Coats

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.

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Edmund Optics GmbH Germany acts as an agent for Edmund Optics Ltd. UK.
The contract partner is Edmund Optics Ltd. UK. Products are shipped from the UK.

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