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  • N-BK7 Windows and H-K9L Windows

    Made from BK7 material, which has transparent range from 330-2100nm. The refractive index is 1.5168 at 587.6nm. The BK7 window has good performance over visible and near IR spectrum for most application.

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N-BK7 Windows

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N-BK7 Windows and H-K9L Windows

Made from BK7 material, which has transparent range from 330-2100nm. The refractive index is 1.5168 at 587.6nm. The BK7 window has good performance over visible and near IR spectrum for most application.



  • product orgin:

    China
  • shipping port:

    Fuzhou China
  • payment:

    T/T Payment, Western Union
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N-BK7 Windows and H-K9L Windows


Made from BK7 material, which has transparent range from 330-2100nm. The refractive index is 1.5168 at 587.6nm. The BK7 window has good performance over visible and near IR spectrum for most application.


H-K9L is the equivalent material to N-BK7. N-BK7 is made of by Schott Germany, H-K9L is made by CDGM China.

H-K9L products price is better than N-BK7.


WTS could make customized N-BK7 or H-K9L windows products 


N-BK7 Windows and H-K9L Windows SPECIFICATION:

Material: BK7 grade A optical glass or H-K9L 
Dimension Tolerance: +0.0, -0.1mm
Thickness Tolerance: ± 0.1mm
Surface quality: 60/40(Standard), 10/5(High Precision)
Clear Aperture: >85%
Flatness: λ(Standard), λ/10(High Precision) per 25mm@633nm
Parallelism: 1' (Standard),  10" (High Precision)
Bevel: <0.25mm X 45°
Coating: Upon requirement

BK7 WindowsH-K9L Windows

Typical Sizes:
Round Shape Φ5.0; Φ10.0 ; Φ12.7; Φ15.0; Φ20.0; 
Diameter(mm): Φ25.4; Φ30.0; Φ38.1; Φ50.8; Φ76.2
Square Shape: 5.0x5.0 ; 10.0x10.0 ; 15.0x15.0 ; 
WxH(mm) 20.0x20.0; 25.0x25.0; 50.0x50.0
Thickness(mm): 0.5; 1.0; 1.5; 2.0; 3.0; 
4.0; 5.0; 6.0; 8.0; 10.0



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