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Products / Optics / Windows and Diffusers / Visible Windows / λ/4 N-BK7 Precision Windows
See all 410 Products in Family
TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

25.4mm Dia., 2mm Thick, Uncoated λ/4 N-BK7 Window

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Stock #15-424 Other Coating Options
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- +
$62.50
Qty 1-5
$62.50
Qty 6+
$53.10
Volume Pricing
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Abbe Number (vd):
64.17
Bevel:
Protective as needed
Clear Aperture (%):
90
Clear Aperture CA (mm):
22.86
Diameter (mm):
25.40 +0.0/-0.25
Thickness (mm):
2.00 ±0.20
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):
<1
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):
λ/4
Surface Quality:
60-40
Type:
Protective Window
Wavelength Range (nm):
350 - 2200
Young's Modulus (GPa):
82
Type of Window:
Glass

Regulatory Compliance

RoHS:
Compliant
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Reach 223:
Compliant
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Certificate of Conformance:
View
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Product Family Description

  • Circular and Square Sizes from 5mm to 150mm
  • 6 Broadband Anti-Reflection Coating Options Available
  • World's Largest selection of Standard N-Bk7 Windows
  • 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.

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. 

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25.0/25.4mm Optic Dia., Kinematic Mount, 3-Screws Adjustable - Tip-Tilt #58-854 $99.00
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25.0/25.4mm Optic Dia., X-Y Translating Optic Mount Adjustable - Linear (XY) #62-956 $253.00
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25.0/25.4mm Optic Dia., X-Y-Z Translating Optic Mount Adjustable - Linear (XYZ) #62-959 $496.00
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25.4mm Optic Dia., 10mm Max Optic Thickness, Optic Mount Fixed #64-561 $29.00
Qty 10+ $26.10 Request Quote
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25.4mm Optic Dia., 13mm Max Optic Thickness, Optic Mount Fixed #64-562 $29.00
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25.0/25.4mm Optic Dia., L-Slot Direct Mount Fixed #36-410 $63.00 Request Quote
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25.0/25.4mm Optic Dia., L-Slot and Rotation Direct Mount Adjustable - Rotary #36-411 $91.00 Request Quote
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25.0/25.4mm Optic Dia., Side Flange Direct Mount Fixed #36-414 $63.00 Request Quote
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25.0/25.4mm Optic Dia., SM1 Thin Mount, M4 Fixed #13-787 $19.00
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25.0/25.4mm Optic Dia., 5 Axes Optical Mount Adjustable - Linear (XYZ) & Tip-Tilt #13-776 $691.00
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4.0 - 36.0mm Optic Dia., Self-Centering Jaw Clamp Fixed #16-077 $141.00
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5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp Fixed #16-078 $367.00
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25.0/25.4mm Optic Diameter, X-Y Translating Quick Start Optical Mounts Adjustable - Linear (XY) #17-513 $294.60 Request Quote
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