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| Products
-> Window-> Special Flatness Window |
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| Special
Flatness Window |
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| Always
we need a window with special flatness like lambda/2 to lambda/5 concave
in our applications. For example, if we make dielectric mirror coating on
a very flat window, after coating the flatness will be changed from very
flat to a little convex, mainly because the deposited coating layers have
big stress. Of course this change is not welcome. We have a solution to
solve this problem. We can make the substrate a little concave before coating,
then it will become very flat after coated as the stress work. |
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| Specifications |
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| Material |
BK7,
UV
grade fused silica |
| Dimension
Tolerance |
+0.0/-0.2mm |
| Thickness
Tolerance |
±0.2mm |
| Clear
Aperture |
>90% |
| Parallelism |
Up
to <5 arc seconds |
| Surface
Quality |
Up to 20/10 scratch and dig |
| Flatness |
Like
λ/2
to λ/3
concave, <λ/5
concave
or special flatness per your requirement |
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