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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