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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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  • IR Windows Calcium fluoride CaF2 Windows

    CaF2 has transparent range from 170-7800nm. The refractive index is 1.399 at 5000nm. 1. Low absorption coefficient 2. High damage threshold, 3. Low Dispersion (with an Abbe Number of 95) 4. Low fluorescence 5. Excellent water, chemical, and heat resistance

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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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