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BK7 Window

BK7 Window are of high precision dimension control, minimal transmitted beam deviation, high surface quality.

With those excellent features, the BK7 window is widely use in projection optics systems, imaging and optical measurement system.

For your wide range of applications, ATE-DENMARK can supply varieties of single layer or multiplayer anti-reflecting coating on optical windows.

Please refer to Coatings chapter for more information.

High Precision BK7 Window
Specifications:
Material BK7 grade A optical glass or Chinese H-K9L
Diameter Tolerance +0.00/-0.05mm
Thickness Tolerance ±0.1mm
Clear Aperture >Central 85% of diameter
Surface Quality 20-10 S/D
Parallelism Refer to the table
Wavefront Distortion λ/10 per 25mm @632.8nm
Protective Bevel <0.25mm x 45°
Coating Uncoated
1 min Parallelism 10 sec Parallelism φ(mm) T(mm)
Part No. Part No.
10.0 6.0
12.7 6.0
25.0 6.0
25.4 6.0
30.0 6.0
50.0 10.0
Standard BK7 Window
Specifications:
Material BK7 grade A optical glass or Chinese H-K9L
Diameter Tolerance +0.0/-0.1mm
Thickness Tolerance ±0.1mm
Clear Aperture >Central 85% of diameter
Surface Quality 60-40 S/D
Parallelism < 1 arc minute
Wavefront Distortion λ/4 per 25mm @632.8nm
Protective Bevel <0.25mm x 45°
Coating Uncoated
Part No. φ(mm) T(mm)
10.0 3.0
12.jul 3.0
15.0 3.0
25.0 3.0
25.apr 3.0
30.0 3.0
50.0 3.0
50.8 3.0

Note: 

Other sizes and coatings are available upon request.

Ultra Precision BK7 Window with λ/20 @632.8nm  and Optical Flat are also available upon request.

The general tolerance specifications above provide a guideline regarding manufacturing capabilities for optics ranging in size from 1-600mm.

The manufacturing limits are not absolute; tighter tolerances may be possible.

Part specific tolerances may vary depending on component size, shape, and/or material.