H-K9L is the alternative for N-BK7.H-K9L (N-BK7) is a RoHS-compliant borosilicate crown glass. It provides excellent transmission in the visible and near-infrared portions of the spectrum (350 nm - 2.0 µm). It is typically chosen whenever the additional benefits of UV fused silica. H-K9L (N-BK7) is probably the most common optical glass used in high-quality optical components.
Specification of BK7 Window
Material |
BK7 |
Diameter |
1 to 500 mm |
Diameter Tolerance |
+0/-0.02 mm |
Thickness Tolerance |
±0.01 mm |
Surface Quality |
10-5 |
Surface Figure |
λ/10 |
Parallelism |
1 Minute |
Coating |
Uncoated, AR, HR, Beamsplitter, etc. |
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