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BK7 Windows

BK7 window is the most common type of window. It has good performance over visible and near infrared wavelength region. At the same time,BK7 window is ideal for applications require minimal transmitted beam deviation. It is suitable for coating AR film.
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Specifications: 
Materials:BK7
Diameter Tolerance +0.0,/-0.15 mm
Thickness Tolerance +/-0.1mm 
Parallelism <3 arc minute
Surface Quality :20-10
Surface Figure:λ/10@633nm 
Bevel:0.25mm×45 ° 
Clear Aperture:90% 
Coating:Specified by customers 
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